Answer: x= -9,8
Explanation:
x=?
y=0
y=x^2+x-72
0=x^2+x-72
0=(x+9)(x-8)
x+9=0 x-8=0
-9 -9 +8 +8
x= -9 x=8
x = -9 and x = 8 when y = 0 is the answer
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