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How do you solve $4x^2 = 81$ ?

1 Answer

Feb 24, 2016

x = ± $9/2$

Explanation:

$" isolate the " x^2 " term , by dividing by 4 "$

hence $x^2 = 81/4$

$rArr x = ± sqrt(81/4) = ± 9/2$

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