How do you simplify $(5 – 2x)(x + 3) times (x + 7)$ ?

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Answer 1 · 2018-06-18T10:22:54

Expand the brackets first

$(5-2x)(x+3)$

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

$15-2x^2-x$

Now multiply this by $(x+7)$

$15x-2x^3-x^2+105-14x^2-7x$

$-2x^3-15x^2+8x+105$

How do you simplify (5 – 2x)(x + 3) times (x + 7)(5 – 2x)(x + 3) times (x + 7)?