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Mathematics

Grade-11

Easy

Question

Solve $x squared minus 1 equals 24$ .

5, -5
6, -6
4, -4
3, -3

The correct answer is: 5, -5

$x squared minus 1 plus 1 equals 24 plus 1$
$x squared equals 25$
$square root of x squared end root equals plus-or-minus square root of 25$
Consider the + or - case.
$x equals plus-or-minus 5$
x = 5 or x = -5.

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