Question

(√a+b)(√a-b) is equal to
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Answer 1

Answer:

$a - {b}^{2}$

Step-by-step explanation:

We know the formula:

$(x + y)(x - y) = x^{2} - {y}^{2}$

so here

$x = \sqrt{a}$

and

$y = b$

Thus

$(\sqrt{a} + b)( \sqrt{a } - b ) = ( \sqrt{a} )^{2} - {b}^{2} \\ = a - {b}^{2}$