find the value of a and b where a+b√15 = √5+ √3 / √5- √3
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rationalise the RHS
√5+√3/√5-√3 × √5+√3/√5+√3
5+3+√15/2
8+√15/2
4+1/2 √15
a = 4 and b= 1/2
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