X(x+9)=x2+15x+12

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Solution for X(x+9)=x2+15x+12 equation: 



X(X+9)=X2+15X+12

We move all terms to the left:

X(X+9)-(X2+15X+12)=0

We add all the numbers together, and all the variables

-(+X^2+15X+12)+X(X+9)=0

We multiply parentheses

-(+X^2+15X+12)+X^2+9X=0

We get rid of parentheses

-X^2+X^2-15X+9X-12=0

We add all the numbers together, and all the variables

-6X-12=0

We move all terms containing X to the left, all other terms to the right

-6X=12

X=12/-6

X=-2

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