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Step-by-step explanation:
√7-√5
√7+√5
=(√7-√5) ×(√7-√5). rationalising the denominator
(√7+√5) ×(√7-√5)
=(√7-√5) ²
(√7)²-(√5) ². ( a+b)(a-b)=a²+b²
=√7²+√5²-2√7√5
7-5
= 7+5-2√25
2
=12-2√25
2
= 2(6-√25)
2
=6-√25=a-b√25
a=6
b=1
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