Find the value of (3 + 2)^3 using the binomial theorem.

Practice Questions

Q1
Find the value of (3 + 2)^3 using the binomial theorem.
  1. 25
  2. 27
  3. 30
  4. 32

Questions & Step-by-Step Solutions

Find the value of (3 + 2)^3 using the binomial theorem.
  • Step 1: Identify the expression we want to calculate, which is (3 + 2)^3.
  • Step 2: Recognize that we can 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 3: In our case, a = 3, b = 2, and n = 3.
  • Step 4: Write out the binomial expansion for (3 + 2)^3 using the formula: C(3,0) * 3^3 * 2^0 + C(3,1) * 3^2 * 2^1 + C(3,2) * 3^1 * 2^2 + C(3,3) * 3^0 * 2^3.
  • Step 5: Calculate each term separately: C(3,0) = 1, C(3,1) = 3, C(3,2) = 3, C(3,3) = 1.
  • Step 6: Calculate the first term: C(3,0) * 3^3 * 2^0 = 1 * 27 * 1 = 27.
  • Step 7: Calculate the second term: C(3,1) * 3^2 * 2^1 = 3 * 9 * 2 = 54.
  • Step 8: Calculate the third term: C(3,2) * 3^1 * 2^2 = 3 * 3 * 4 = 36.
  • Step 9: Calculate the fourth term: C(3,3) * 3^0 * 2^3 = 1 * 1 * 8 = 8.
  • Step 10: Add all the terms together: 27 + 54 + 36 + 8 = 125.
  • Step 11: Conclude that the value of (3 + 2)^3 is 125.
  • Binomial Theorem – The binomial theorem provides a formula for expanding expressions of the form (a + b)^n, where n is a non-negative integer.
  • Combinatorial Coefficients – The coefficients C(n, k) represent the number of ways to choose k elements from a set of n elements, which are used in the expansion.
  • Exponents and Powers – Understanding how to calculate powers of numbers and apply them in the context of the binomial expansion.
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