Question

(x^2-6x)^2-35(x^2-6x)-200=0

Answer 1

solve u^2-35u-200=0
find two factors of -200 that have product -200 and have sum -35
-200=-40(5)
-35=-40+5
now replace bu=-35u with -40u+5u
like
u^2-40u+5u-200=0
now factor by grouping

Answer 2

let me see the step after this one

Answer 3

show me whenever you like