Question

Find the value of (√a + √b) (√a – √b) is * (a) a + b
(b) a – b
(c) 2√a
(d) 2√b


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Answer 1

Step-by-step explanation:

✓a(✓a-✓b)+✓b(✓a-✓b)

a-✓ab+✓ab-b

a-b

Answer 2

Answer:

• (b) a – b

Step-by-step explanation:

To Find:

(√a + √b) (√a – √b)

Solve:

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