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Find the coefficient of x^5 in the expansion of (x + 3)^8.
Find the coefficient of x^5 in the expansion of (x + 3)^8.
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Practice Questions
1 question
Q1
Find the coefficient of x^5 in the expansion of (x + 3)^8.
56
168
336
672
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The coefficient of x^5 is C(8,5) * (3)^3 = 56 * 27 = 1512.
Questions & Step-by-step Solutions
1 item
Q
Q: Find the coefficient of x^5 in the expansion of (x + 3)^8.
Solution:
The coefficient of x^5 is C(8,5) * (3)^3 = 56 * 27 = 1512.
Steps: 8
Show Steps
Step 1: Identify the expression we need to expand, which is (x + 3)^8.
Step 2: Understand that we want to find the coefficient of x^5 in this expansion.
Step 3: Use the binomial theorem, which states that (a + b)^n = Σ (C(n, k) * a^(n-k) * b^k) for k = 0 to n.
Step 4: In our case, a = x, b = 3, and n = 8.
Step 5: We need to find the term where x is raised to the power of 5, which means we need k = 3 (since 8 - 5 = 3).
Step 6: Calculate C(8, 5), which is the number of ways to choose 5 items from 8. This is equal to C(8, 3) = 8! / (3! * (8-3)!) = 56.
Step 7: Calculate 3^3, which is 3 * 3 * 3 = 27.
Step 8: Multiply the coefficient C(8, 5) by 3^3 to find the coefficient of x^5: 56 * 27 = 1512.
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