Question:

Which expression is equivalent to 5x(x+3)-2(x^2+3x-4)?

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A. 3x^2+9x-8

B. 3x^2+9x+8

C. 3x^2+21x-8

D. 3x^2+21x+8

can you show me step by step plz?!!!

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  1. 5x (x + 3) - 2 (x^2 + 3x - 4)

    (5x * x) + (5x * 3) + (-2 * x^2) + (-2 * 3x) + (-2 * -4)

    5x^2 + 15x - 2x^2 - 6x + 8

    (5x^2 - 2x^2) + (15x - 6x) + 8

    3x^2 + 9x + 8

    So the answer is B.

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