Solve using the Square Root Property x^2-x-72=0

Math
x2-x-72=0
Factor x2-x-72 using the AC method.
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Consider the form x2+bx+c. Find a pair of integers whose product is c and whose sum is b. In this case, whose product is -72 and whose sum is -1.
-9,8
Write the factored form using these integers.
(x-9)(x+8)=0
(x-9)(x+8)=0
If any individual factor on the left side of the equation is equal to 0, the entire expression will be equal to 0.
x-9=0
x+8=0
Set the first factor equal to 0 and solve.
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Set the first factor equal to 0.
x-9=0
Add 9 to both sides of the equation.
x=9
x=9
Set the next factor equal to 0 and solve.
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Set the next factor equal to 0.
x+8=0
Subtract 8 from both sides of the equation.
x=-8
x=-8
The final solution is all the values that make (x-9)(x+8)=0 true.
x=9,-8
Solve using the Square Root Property x^2-x-72=0

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