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A Student Tries to Solve x+7=x+4\sqrt{\mathrm{x}+7}=\sqrt{\mathrm{x}}+4 By Squaring Both Sides and Gets

Question 13

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A student tries to solve x+7=x+4\sqrt{\mathrm{x}+7}=\sqrt{\mathrm{x}}+4 by squaring both sides and gets x+7=x+16\mathrm{x}+7=\mathrm{x}+16 .
Why is this not correct?

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Squaring the right s...

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