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\left(x-3\right)\left(x-3\right)=\left(x+3\right)\left(3+x\right)
Variable x cannot be equal to any of the values -3,3 since division by zero is not defined. Multiply both sides of the equation by \left(x-3\right)\left(x+3\right), the least common multiple of x+3,x-3.
\left(x-3\right)^{2}=\left(x+3\right)\left(3+x\right)
Multiply x-3 and x-3 to get \left(x-3\right)^{2}.
\left(x-3\right)^{2}=\left(x+3\right)^{2}
Multiply x+3 and 3+x to get \left(x+3\right)^{2}.
x^{2}-6x+9=\left(x+3\right)^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-3\right)^{2}.
x^{2}-6x+9=x^{2}+6x+9
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+3\right)^{2}.
x^{2}-6x+9-x^{2}=6x+9
Subtract x^{2} from both sides.
-6x+9=6x+9
Combine x^{2} and -x^{2} to get 0.
-6x+9-6x=9
Subtract 6x from both sides.
-12x+9=9
Combine -6x and -6x to get -12x.
-12x=9-9
Subtract 9 from both sides.
-12x=0
Subtract 9 from 9 to get 0.
x=0
Product of two numbers is equal to 0 if at least one of them is 0. Since -12 is not equal to 0, x must be equal to 0.