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

1 Answer

Jan 22, 2016

Re-write the equation in standard form; then factor to get
$color(white)("XXX")x=3$ or $x=5$

Explanation:

$8x-x^2=15$

$hArr x^2-8x+15=0$

$hArr (x-3)(x-5)=0$

$(x-3)=0 rarr x=3$
or
$(x-5)=0 rarr x=5$

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