Question

If a + b = 1 and a - b = 7, find
(i) 5(a2 + b2)
(ii) ab​

Answer 1

(i): 5(a2+b2) = 80 (ii): ab = 7

Answer 2

(1) 5( a2 + b2 ) = 80

(2) ab = 1 × 7 = 7

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