Question

answer full question

Answer 1

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Answer 2

Here is your answer
$(3x + 5)(5 - 2x) \\ = 3x(5 - 2x) + 5(5 - 2x) \\ = 15x - 6x {}^{2} + 25 - 10x \\ = - 6x {}^{2} + 5x + 25 \\ \\ (x + 3y)(3x - y) \\ = x(3x - y) + 3y(3x - y) \\ = 3x {}^{2} - xy + 9xy - 3y {}^{2} \\ = 3x {}^{2} - 3y {}^{2} + 8xy \\ \\ \\ (a {}^{2} + b)(a + b {}^{2} ) \\ = a {}^{3} +( ab) {}^{2} + ba + b {}^{3}$
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