Solve this equation using an algebraic method: (x + 4)( x - 4) = 9. Please use your own answer :)

asked Jul 7, 2017 93.5k views

4 votes

Solve this equation using an algebraic method: (x + 4)( x - 4) = 9.

Please use your own answer :)

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3 votes

$\star \ (x + 4)( x - 4) = 9.$

$\star \ x^2-4^2=9$
$Expand \ the \ given \ equation$

$\star$
x^2-16=9

$\star$

$Combine \ like \ terms$

$\star$
x^2=25

$\star$

$\star$

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