Question

Solve: (√x + 2)(√x - 2) = 0

Answer 1

Answer:

$( \sqrt{X} + 2)( \sqrt{x} - 2) = 0$

$(A + B)(A - B) = (A {}^{2} - B {}^{2})$

$A = \sqrt{X}$

$B = 2$

Now

$( \sqrt{X} ) {}^{2} -( 2) {}^{2} = 0$

$X - 4 = 0$

$X = 4$

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