Solve for R R^2+R=210

Math
R2+R=210
Move 210 to the left side of the equation by subtracting it from both sides.
R2+R-210=0
Factor R2+R-210 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 -210 and whose sum is 1.
-14,15
Write the factored form using these integers.
(R-14)(R+15)=0
(R-14)(R+15)=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-14=0
R+15=0
Set the first factor equal to 0 and solve.
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Set the first factor equal to 0.
R-14=0
Add 14 to both sides of the equation.
R=14
R=14
Set the next factor equal to 0 and solve.
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Set the next factor equal to 0.
R+15=0
Subtract 15 from both sides of the equation.
R=-15
R=-15
The final solution is all the values that make (R-14)(R+15)=0 true.
R=14,-15
Solve for R R^2+R=210

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