Solve for x
x=21
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0x^{2}+10x-210=0
Multiply 0 and 1 to get 0.
0+10x-210=0
Anything times zero gives zero.
-210+10x=0
Subtract 210 from 0 to get -210.
10x=210
Add 210 to both sides. Anything plus zero gives itself.
x=\frac{210}{10}
Divide both sides by 10.
x=21
Divide 210 by 10 to get 21.
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