MathsAges 16-18

Binomial theorem coefficients

Use combinations C(n, r) and powers to find specific coefficients in the binomial expansion of (x + k)ⁿ. Review suitability for your learners before teaching.

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Worksheet StudioPractice pack · Ages 16-18

Binomial theorem coefficients

Take your time. Show your thinking.

1. Find the coefficient of x^2 in the binomial expansion of (x + 3)^5.
2 · 3 · 5 · Binomial theorem coefficie…
2. Find the coefficient of x^2 in the binomial expansion of (x + 6)^3.
2 · 6 · 3 · Binomial theorem coefficie…
3. Find the coefficient of x^2 in the binomial expansion of (x + 4)^4.
2 · 4 · 4 · Binomial theorem coefficie…
4. Find the coefficient of x^5 in the binomial expansion of (x + 6)^6.
5 · 6 · 6 · Binomial theorem coefficie…
5. Find the coefficient of x^2 in the binomial expansion of (x + 5)^3.
2 · 5 · 3 · Binomial theorem coefficie…
6. Find the coefficient of x^1 in the binomial expansion of (x + 6)^5.
1 · 6 · 5 · Binomial theorem coefficie…
7. Find the coefficient of x^1 in the binomial expansion of (x + 2)^6.
1 · 2 · 6 · Binomial theorem coefficie…
8. Find the coefficient of x^1 in the binomial expansion of (x + 7)^4.
1 · 7 · 4 · Binomial theorem coefficie…
9. Find the coefficient of x^2 in the binomial expansion of (x + 3)^3.
2 · 3 · 3 · Binomial theorem coefficie…
10. Find the coefficient of x^2 in the binomial expansion of (x + 5)^6.
2 · 5 · 6 · Binomial theorem coefficie…
11. Find the coefficient of x^2 in the binomial expansion of (x + 5)^5.
2 · 5 · 5 · Binomial theorem coefficie…
12. Find the coefficient of x^1 in the binomial expansion of (x + 3)^3.
1 · 3 · 3 · Binomial theorem coefficie…

12 questions · Seed 44 · Age guidance, not curriculum certification

View the answer key

Worksheet StudioAnswer key · Ages 16-18

Binomial theorem coefficients

Answers and reasoning. Review before teaching.

1. Find the coefficient of x^2 in the binomial expansion of (x + 3)^5.
270
By the binomial theorem, the x^2 term has coefficient C(5, 3) × 3^3 = 10 × 27 = 270.
2. Find the coefficient of x^2 in the binomial expansion of (x + 6)^3.
18
By the binomial theorem, the x^2 term has coefficient C(3, 1) × 6^1 = 3 × 6 = 18.
3. Find the coefficient of x^2 in the binomial expansion of (x + 4)^4.
96
By the binomial theorem, the x^2 term has coefficient C(4, 2) × 4^2 = 6 × 16 = 96.
4. Find the coefficient of x^5 in the binomial expansion of (x + 6)^6.
36
By the binomial theorem, the x^5 term has coefficient C(6, 1) × 6^1 = 6 × 6 = 36.
5. Find the coefficient of x^2 in the binomial expansion of (x + 5)^3.
15
By the binomial theorem, the x^2 term has coefficient C(3, 1) × 5^1 = 3 × 5 = 15.
6. Find the coefficient of x^1 in the binomial expansion of (x + 6)^5.
6480
By the binomial theorem, the x^1 term has coefficient C(5, 4) × 6^4 = 5 × 1296 = 6480.
7. Find the coefficient of x^1 in the binomial expansion of (x + 2)^6.
192
By the binomial theorem, the x^1 term has coefficient C(6, 5) × 2^5 = 6 × 32 = 192.
8. Find the coefficient of x^1 in the binomial expansion of (x + 7)^4.
1372
By the binomial theorem, the x^1 term has coefficient C(4, 3) × 7^3 = 4 × 343 = 1372.
9. Find the coefficient of x^2 in the binomial expansion of (x + 3)^3.
9
By the binomial theorem, the x^2 term has coefficient C(3, 1) × 3^1 = 3 × 3 = 9.
10. Find the coefficient of x^2 in the binomial expansion of (x + 5)^6.
9375
By the binomial theorem, the x^2 term has coefficient C(6, 4) × 5^4 = 15 × 625 = 9375.
11. Find the coefficient of x^2 in the binomial expansion of (x + 5)^5.
1250
By the binomial theorem, the x^2 term has coefficient C(5, 3) × 5^3 = 10 × 125 = 1250.
12. Find the coefficient of x^1 in the binomial expansion of (x + 3)^3.
27
By the binomial theorem, the x^1 term has coefficient C(3, 2) × 3^2 = 3 × 9 = 27.

12 questions · Seed 44 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 16-18

Binomial theorem coefficients

Take your time. Show your thinking.

1. Find the coefficient of x^2 in the binomial expansion of (x + 3)^5.
2 · 3 · 5 · Binomial theorem coefficie…
2. Find the coefficient of x^2 in the binomial expansion of (x + 6)^3.
2 · 6 · 3 · Binomial theorem coefficie…
3. Find the coefficient of x^2 in the binomial expansion of (x + 4)^4.
2 · 4 · 4 · Binomial theorem coefficie…
4. Find the coefficient of x^5 in the binomial expansion of (x + 6)^6.
5 · 6 · 6 · Binomial theorem coefficie…
5. Find the coefficient of x^2 in the binomial expansion of (x + 5)^3.
2 · 5 · 3 · Binomial theorem coefficie…
6. Find the coefficient of x^1 in the binomial expansion of (x + 6)^5.
1 · 6 · 5 · Binomial theorem coefficie…
7. Find the coefficient of x^1 in the binomial expansion of (x + 2)^6.
1 · 2 · 6 · Binomial theorem coefficie…
8. Find the coefficient of x^1 in the binomial expansion of (x + 7)^4.
1 · 7 · 4 · Binomial theorem coefficie…
9. Find the coefficient of x^2 in the binomial expansion of (x + 3)^3.
2 · 3 · 3 · Binomial theorem coefficie…
10. Find the coefficient of x^2 in the binomial expansion of (x + 5)^6.
2 · 5 · 6 · Binomial theorem coefficie…
11. Find the coefficient of x^2 in the binomial expansion of (x + 5)^5.
2 · 5 · 5 · Binomial theorem coefficie…
12. Find the coefficient of x^1 in the binomial expansion of (x + 3)^3.
1 · 3 · 3 · Binomial theorem coefficie…

12 questions · Seed 44 · Age guidance, not curriculum certification

Worksheet StudioAnswer key · Ages 16-18

Binomial theorem coefficients

Answers and reasoning. Review before teaching.

1. Find the coefficient of x^2 in the binomial expansion of (x + 3)^5.
270
By the binomial theorem, the x^2 term has coefficient C(5, 3) × 3^3 = 10 × 27 = 270.
2. Find the coefficient of x^2 in the binomial expansion of (x + 6)^3.
18
By the binomial theorem, the x^2 term has coefficient C(3, 1) × 6^1 = 3 × 6 = 18.
3. Find the coefficient of x^2 in the binomial expansion of (x + 4)^4.
96
By the binomial theorem, the x^2 term has coefficient C(4, 2) × 4^2 = 6 × 16 = 96.
4. Find the coefficient of x^5 in the binomial expansion of (x + 6)^6.
36
By the binomial theorem, the x^5 term has coefficient C(6, 1) × 6^1 = 6 × 6 = 36.
5. Find the coefficient of x^2 in the binomial expansion of (x + 5)^3.
15
By the binomial theorem, the x^2 term has coefficient C(3, 1) × 5^1 = 3 × 5 = 15.
6. Find the coefficient of x^1 in the binomial expansion of (x + 6)^5.
6480
By the binomial theorem, the x^1 term has coefficient C(5, 4) × 6^4 = 5 × 1296 = 6480.
7. Find the coefficient of x^1 in the binomial expansion of (x + 2)^6.
192
By the binomial theorem, the x^1 term has coefficient C(6, 5) × 2^5 = 6 × 32 = 192.
8. Find the coefficient of x^1 in the binomial expansion of (x + 7)^4.
1372
By the binomial theorem, the x^1 term has coefficient C(4, 3) × 7^3 = 4 × 343 = 1372.
9. Find the coefficient of x^2 in the binomial expansion of (x + 3)^3.
9
By the binomial theorem, the x^2 term has coefficient C(3, 1) × 3^1 = 3 × 3 = 9.
10. Find the coefficient of x^2 in the binomial expansion of (x + 5)^6.
9375
By the binomial theorem, the x^2 term has coefficient C(6, 4) × 5^4 = 15 × 625 = 9375.
11. Find the coefficient of x^2 in the binomial expansion of (x + 5)^5.
1250
By the binomial theorem, the x^2 term has coefficient C(5, 3) × 5^3 = 10 × 125 = 1250.
12. Find the coefficient of x^1 in the binomial expansion of (x + 3)^3.
27
By the binomial theorem, the x^1 term has coefficient C(3, 2) × 3^2 = 3 × 9 = 27.

12 questions · Seed 44 · Age guidance, not curriculum certification