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Mathematics 17 Online
OpenStudy (anonymous):

Simplify: (4x + 6)(6x2 - 5x - 3) A. 24x3 + 16x2 - 18x - 18 B. 24x3 + 16x2 - 42x - 18 C. 24x3 + 56x2 - 42x - 18 D. 24x3 + 56x2 + 18x - 18

OpenStudy (masumanwar):

Most probably B as 36 -20=16 and 12 +30=42 for x square and x coefficients

jimthompson5910 (jim_thompson5910):

Use the distributive property twice to get this (4x + 6)(6x^2 - 5x - 3) 4x(6x^2 - 5x - 3) + 6(6x^2 - 5x - 3) 4x(6x^2) + 4x(-5x) + 4x(-3) + 6(6x^2) + 6(-5x) + 6(-3) 24x^3 - 20x^2 - 12x + 36x^2 - 30x - 18 24x^3 + 16x^2 - 42x - 18

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