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Mathematics

Grade10

Easy

Question

Find the solutions of equation $x squared equals 144$

$x = + 12$
$x = \pm 12$
$x = - 12$
$x = \pm (- 12)$

The correct answer is: $x equals plus-or-minus 12$

$x squared equals 144$
Taking square root on both the sides of the equation, we get
$√ left parenthesis x squared right parenthesis equals plus-or-minus √ 144$
$x equals plus-or-minus 12$

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