Question

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

Answer 1

Answer:

a+b=1. .... 1

a-b=7. .....2

eq 1 +eq 2

2a=8

a=4

substiuting the value of a in eq 1

4+b=1

b=-3

(i). a²+b²=16+9=25

(ii). ab=4(-3)= -12

this is your answer hope it helps

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