find the square root of the following by division method??
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a) (5+√7) (2+√5)
according to identity,
(a+ b)(c+d) = ac+ad+bc+bd
⇒5(2+√5) +√7(2+√5)
⇒10+5√5+2√7+√7√5
⇒10+5√5+2√7+√35
b) (5+√5) (5-√5)
according to identity,
(a+b) (a-b)= a²-b²
⇒5²-(√5)²
⇒25-5
⇒20
Hope it helps, please mark me as brainliest, thanks! :)
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