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Question #714be

1 Answer

Feb 18, 2017

$y^{2} + y - 20$ $y^2+y-20$

Explanation:

Given $(y + 5) (y - 4)$ $" "color(blue)((y+5)color(green)((y-4))$

Multiply everything in the second bracket by everything in the first.

$y (y - 4) + 5 (y - 4)$ $color(green)(color(blue)(y)(y-4) color(blue)(" "+" "5)(y-4))$

$y^{2} - 4 y + 5 y - 20$ $y^2-4y" "+" "5y-20$

$y^{2} + y - 20$ $y^2+y-20$

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