Question

a+b= 5, ab = 6 and a.b, find the valur of 4( a^2-b^2) -a^2-b^2

Answer 1

$a = 3 \\ b = 2 \\ 4(3 \times 2 - 2 \times 2) - 3 \times 2 - 2 \times 2 \\ 4(6 - 4) - 6 - 4 \\ 8 - 10 \\ - 2$