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Question

Say true or false.
If $x^{2} - 64 = 0$ , then $x = 8$ or $x = - 8$ .

A

True

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B

False

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Solution

The correct option is A True
Given equation is, $x^{2} - 64 = 0$
By using formula, $a^{2} - b^{2} = (a + b) (a - b)$
$x^{2} - 64 = x^{2} - 8^{2}$
$(x - 8) (x + 8) = 0$
$∴ x = - 8, 8$

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