(√a+√b) (√a-√b) How to find it's answer ?
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Without using Identity
(√a + √b) (√a - √b)
√a(√a - √b) + √b(√a - √b)
a - √a√b + √a√b - b
cancelling out ➠ √a√b
a - b
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Using identity ➠ (a + b)(a - b) = a² - b²
(√a + √b) (√a - √b)
(√a)² - (√b)²
a - b
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