factoring trinomials by grouping?

Question

what do i do in this situation?
7x^2-71x+10
so 7*10=70
-70+-1=-71

7x^2-70x-x+10
7x(x-10)-(x+10)


rut rooooowww!

i don't remember what to do!

thanks in advance!

i'm not seeing my math error....

Answer 1

I never got the hang of grouping either.
(7x-1)(x-10) look like it.

Looks like you got close, but you have a math error on the next to last line.