Choose the solutions to the quadratic equation x2 – 8x – 9 = 0. -21 -1 9 29

Is that x^2
because if it is
you have to multiply the 1 to the 9(a times c)
and you should get -9 then factor out -9 into 1,9  2 and nothing 3,3 the make the nine negative and the 1 positive add and youll get -8.
make groups (x-9) (x+1) < groups                  next make em equal to 0
x-9=0        x+1=0    simplify and choose the right answer there will be two answers but if one is a option choose the one the is a option.

hopefully i help ^_^