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How do you solve $- 15 = x^{2} + 8 x$ $-15=x^2+8x$ ?

1 Answer

Feb 24, 2016

Rearrange into standard form then factor to discover
$XXX x = - 3 or x = - 5$ $color(white)("XXX")x=-3 or x=-5$

Explanation:

$- 15 = x^{2} + 8 x$ $-15 = x^2+8x$

In standard form:
$x^{2} + 8 x + 15 = 0$ $x^2+8x+15=0$

Factored:
$(x + 3) (x + 5) = 0$ $(x+3)(x+5)=0$

$\Rightarrow x = - 3 or x = - 5$ $rArr x=-3 or x=-5$

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