Solve for r r^2+3r-4=0

Math
r2+3r-4=0
Factor r2+3r-4 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 -4 and whose sum is 3.
-1,4
Write the factored form using these integers.
(r-1)(r+4)=0
(r-1)(r+4)=0
If any individual factor on the left side of the equation is equal to 0, the entire expression will be equal to 0.
r-1=0
r+4=0
Set the first factor equal to 0 and solve.
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Set the first factor equal to 0.
r-1=0
Add 1 to both sides of the equation.
r=1
r=1
Set the next factor equal to 0 and solve.
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Set the next factor equal to 0.
r+4=0
Subtract 4 from both sides of the equation.
r=-4
r=-4
The final solution is all the values that make (r-1)(r+4)=0 true.
r=1,-4
Solve for r r^2+3r-4=0

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