Question

1)2x(3x-5)+17(5-3x)
2) (a-b)²-a(b-a)
²

Answer 1

1)6$x^{2}$-10X+85-51x=0
6$x^{2}$-61x85=0
D=$61^{2}$-4*85*6=$41^{2}$
x=20/12=5/3
x=102/12=34/4