Question 130013
1) this uses the quadratic formula
__ for ax^2+bx+c=0 __ x=(-b plus or minus sqrt(b^2-4ac))/2a


2) u^2-11u-80=0
__ factoring __ (u-16)(u+5)=0 __ u=16 and u=-5


substituting __ x^2-6x=16 __ x^2-6x-16=0
__ factoring __ (x-8)(x+2)=0 __ x=8 and x=-2


substituting __ x^2-6x=-5 __ x^2-6x+5=0
__ factoring __ (x-5)(x-1)=0 __ x=5 and x=1