Find the coefficient of x10 in the expansion of (2x − 3)14.
Question
Find the coefficient of x10 in the expansion of (2x − 3)14.
Solution 1
To find the coefficient of x^10 in the expansion of (2x - 3)^14, we can use the binomial theorem, which states that (a + b)^n = Σ (n choose k) * a^(n-k) * b^k, where the sum is from k = 0 to n.
In this case, a = 2x, b = -3, and n = 14. We want to find the term where the power of x is 10, so we need to find the term where a is raised to the power of 10. This happens when k = 4 (because a is raised to the power of n - k).
So, we need to calculate the coefficient of the term where k = 4. This is given by (14 choose 4) * (2x)^10 * (-3)^4.
(14 choose 4) = 14! / [4!(14 - 4)!] = 1001 (2x)^10 = 1024x^10 (-3)^4 = 81
So, the coefficient of x^10 is 1001 * 1024 * 81 = 83,519,425,024.
Solution 2
To find the coefficient of x^10 in the expansion of (2x - 3)^14, we can use the binomial theorem, which states that:
(a + b)^n = Σ (from k=0 to n) [C(n, k) * a^(n-k) * b^k]
where C(n, k) is the binomial coefficient "n choose k".
In this case, a = 2x, b = -3, and n = 14. We want to find the coefficient of x^10, so we need to find the term where a is raised to the power of 4 (since (2x)^4 = 16x^10).
So, we need to find the coefficient of the term where k = 10 (since n - k = 4).
The coefficient is therefore:
C(14, 10) * (2x)^4 * (-3)^10
= 1001 * 16x^4 * 59049
= 947,665,344x^10
So, the coefficient of x^10 in the expansion of (2x - 3)^14 is 947,665,344.
Solution 3
To find the coefficient of x^10 in the expansion of (2x - 3)^14, we can use the binomial theorem, which states that (a + b)^n = Σ (n choose k) * a^(n-k) * b^k, where the sum is from k = 0 to n.
In this case, a = 2x, b = -3, and n = 14. We want to find the term where the power of x is 10, so we need to find the term where a is raised to the power of 10. This happens when k = 4 (because a is raised to the power of n - k).
So, we need to calculate the coefficient of the term where k = 4. This is given by (14 choose 4) * (2x)^10 * (-3)^4.
(14 choose 4) = 14! / [4!(14 - 4)!] = 1001 (2x)^10 = 1024x^10 (-3)^4 = 81
So, the coefficient of x^10 is 1001 * 1024 * 81 = 83,519,425,024.
Solution 4
To find the coefficient of x^10 in the expansion of (2x - 3)^14, we can use the binomial theorem, which states that (a + b)^n = Σ (n choose k) * a^(n-k) * b^k, where the sum is from k = 0 to n.
In this case, a = 2x, b = -3, and n = 14. We want to find the term where the power of x is 10, so we need to find the term where a is raised to the power of 10. This happens when k = 4 (because a is raised to the power of n - k).
So, we need to calculate the coefficient of the term where k = 4. This is given by (14 choose 4) * (2x)^10 * (-3)^4.
(14 choose 4) = 14! / [4!(14 - 4)!] = 1001 (2x)^10 = 1024x^10 (-3)^4 = 81
So, the coefficient of x^10 is 1001 * 1024 * 81 = 83,519,425.
Solution 5
To find the coefficient of x^10 in the expansion of (2x - 3)^14, we can use the binomial theorem, which states that (a + b)^n = Σ (n choose k) * a^(n-k) * b^k, where the sum is from k = 0 to n.
In this case, a = 2x, b = -3, and n = 14. We want to find the term where the power of x is 10, so we need to find the term where a is raised to the power of 10. This happens when k = 4 (because a is raised to the power of n - k).
So, we need to calculate the coefficient of the term where k = 4. This is given by (14 choose 4) * (2x)^10 * (-3)^4.
(14 choose 4) = 14! / [4!(14 - 4)!] = 1001 (2x)^10 = 1024x^10 (-3)^4 = 81
So, the coefficient of x^10 is 1001 * 1024 * 81 = 83,519,425,024.
Solution 6
To find the coefficient of x^10 in the expansion of (2x - 3)^14, we can use the binomial theorem, which states that (a + b)^n = Σ (n choose k) * a^(n-k) * b^k, where the sum is from k = 0 to n.
In this case, a = 2x, b = -3, and n = 14. We want to find the term where the power of x is 10, so we need to find the term where a is raised to the power of 10. This happens when k = 4 (because a is raised to the power of n - k).
So, we need to calculate the coefficient of the term where k = 4. This is given by (14 choose 4) * (2x)^10 * (-3)^4.
(14 choose 4) = 14! / [4!(14 - 4)!] = 1001 (2x)^10 = 1024x^10 (-3)^4 = 81
So, the coefficient of x^10 is 1001 * 1024 * 81 = 83,519,425,024.
Solution 7
To find the coefficient of x^10 in the expansion of (2x - 3)^14, we can use the binomial theorem, which states that (a + b)^n = Σ (n choose k) * a^(n-k) * b^k, where the sum is from k = 0 to n.
In this case, a = 2x, b = -3, and n = 14. We want to find the term where the power of x is 10, so we need to find the term where a is raised to the power of 10. This happens when k = 4 (because a is raised to the power of n - k).
So, we need to calculate the coefficient of the term where k = 4. This is given by (14 choose 4) * (2x)^10 * (-3)^4.
(14 choose 4) = 14! / [4!(14 - 4)!] = 1001 (2x)^10 = 1024x^10 (-3)^4 = 81
So, the coefficient of x^10 is 1001 * 1024 * 81 = 83,886,080.
Solution 8
To find the coefficient of x^10 in the expansion of (2x - 3)^14, we can use the binomial theorem, which states that (a + b)^n = Σ (n choose k) * a^(n-k) * b^k, where the sum is from k = 0 to n.
In this case, a = 2x, b = -3, and n = 14. We want to find the term where the power of x is 10, so we need to find the term where a is raised to the power of 10. This happens when k = 4 (because a is raised to the power of n - k).
So, we need to calculate the coefficient of the term where k = 4. This is given by (14 choose 4) * (2x)^10 * (-3)^4.
(14 choose 4) = 14! / [4!(14 - 4)!] = 1001 (2x)^10 = 1024x^10 (-3)^4 = 81
So, the coefficient of x^10 is 1001 * 1024 * 81 = 83,886,080.
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