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Mathematics

Grade-11

Easy

Question

Solve $2 x squared minus 3 equals 15$ .

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

The correct answer is: 3, -3

To use the square root method, we need to start by isolating the $x squared$ .
$2 x squared minus 3 equals 15$
$2 x squared equals 18$
$x squared equals 9$
At this point, you can take the square root of both sides.
$square root of x squared end root equals plus-or-minus square root of 9$
$x equals plus-or-minus 3$ .

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x - 7 = 0 or x + 2 = 0
x = 7 or x = -2

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x - 7 = 0 or x + 2 = 0
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