Answer:
x = 5, x = 2
Step-by-step explanation:
y=x²-7x+7 but also y=-3
so x²-7x+7=-3
x²-7x+10=0
when factorising think about 2 numbers you multiply by each other tp give 10 but at the same time their sum is 7
-5x-2=10
-5+-2=-7
so (x-5)(x-2)=0
(note: multiply the two brackets to check if ur answer is correct and that it gives x²-7x+10=0)
x-5=0 so x=5
but also x-2=0 so x=2
