Please solve this 3 questions ASAP!! :)
@Rationalise the Denominator!!
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(a) 5/√7 +√8
=5/√7 +√8 × √7 -√8/ √7-√8
=5 (√7-√8)/(√7)^2 -(√8)^2
=5√7 -5√8/ 7-8
=5√7 -5√8/-1
=5√8 -5√7
B. 4/√7-√5
=4/√7-√5 × √7+√5/√7+√5
=4 (√7 +√5)/(√7)^2-(√5)^2
=4 (√7+√5)/7-5
=4 (√7+√5/2
=2√7+2√5
(a) 5/√7 +√8
=5/√7 +√8 × √7 -√8/ √7-√8
=5 (√7-√8)/(√7)^2 -(√8)^2
=5√7 -5√8/ 7-8
=5√7 -5√8/-1
=5√8 -5√7
B. 4/√7-√5
=4/√7-√5 × √7+√5/√7+√5
=4 (√7 +√5)/(√7)^2-(√5)^2
=4 (√7+√5)/7-5
=4 (√7+√5/2
=2√7+2√5
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