Question

If a square+ b square =34 & ab=12; find:
1. 3 (a+b)square + 5 (a-b)square
2. 7 (a-b)square -2 (a+b)square

Answer 1

a^2+b^2=34

ab=12

1)..3(a^2+b^2+2ab)+5(a^2+b^2-2ab)

3(34+24)+5(34-24)

3(58)+5(10)

174+50

224

2)..7(a^2+b^2-2ab)-2(a^2+b^2+2ab)

7(10)-2(58)

70-116

-46