Answer:
Step-by-step explanation:
f(x)=x²-2x+3
f(x)=-2x+12
x²-2x+3=-2x+12
x²-9=0
(x-3)(x+3)=0
x=3,-3
when x=3 ,f(x)=-2×3+12=-6+12=6
when x=-3,f(x)=-2×-3+12=6+12=18
solutions are (3,6);(-3,18)
