Digital ACT Math Practice Question #1435
Test your problem-solving accuracy on this official-caliber item. Select an answer choice to check your reasoning instantly.
C(5, 2) * (2)^3 * (-3)^2 = 10 * 8 * 9 = +720.
The general term is C(5, k) * (2x)^(5-k) * (-3)^k. For x^3, 5 - k = 3, so k = 2. C(5, 2) * (2x)^3 * (-3)^2 = 10 * (8x^3) * 9 = 720x^3... wait: (-3)^2 is POSITIVE 9! So 10 * 8 * 9 = +720....
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