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Solve the quadratic equation x2 − 9 = 0

May 16, 2026Mathematics

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Answer

x = \pm 3

2 steps

Add 9 to both sides of the equation.
$x^2 - 9 = 0$ $x^2 = 9$
Take the square root of both sides.
Remember to include both positive and negative roots.
$\sqrt{x^2} = \pm\sqrt{9}$ $x = \pm 3$
The solutions are $x = 3$ or $x = -3$ .

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