Q10 of 81 Page 161

If and the value of (a2 + b2) is

a + b = √5


a = √5 – b


a–b = √3


(√5 – b) – b = √3


2b = √5 - √3


b =


a = √5 – b = √5 – =


ab = × = =


(a + b)2 = a2 + b2 + 2ab


(√5)2 = a2 + b2 + 2 ×


a2 + b2 = 5 – 1 = 4

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