arrow_back Solve the equation $\sqrt{x+18}=x-2$

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Solve the equation $\sqrt{x+18}=x-2$

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Best answer

Best answer

Answer:

$x=7 \quad$ or $\quad x \neq-2$

Explanation:

$\sqrt{x+18}=x-2$
$x+18=x^{2}-4 x+4$
$0=x^{2}-5 x-14$
$(x-7)(x+2)=0$
$x=7 \quad$ or $\quad x \neq-2$

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