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How do you solve $-20x^2 + 320 = 0$ ?

1 Answer

Jul 23, 2015

$x=color(blue)(+4 , -4$

Explanation:

$-20x^2 = -320$

$20x^2 = 320$

$x^2 = 320/20$

$x^2 = 16$

$x=sqrt16$

$x=color(blue)(+-4$

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