Answer:
x=5 x=4
Explanation:
y=x^2-9x+20
Set equal to zero
0 =x^2-9x+20
Factor
What two numbers multiply to 20 and add to -9
-5*-4 = 20
-5+-4 = -9
0=(x-5) (x-4)
Using the zero product property
x-5 =0 x-4 =0
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