That is not an equation. Perhaps you mean
x^2 + 13x + 36 = 0
which IS an equation.
It can be factored as
(x+9)(x+4) = 0
So the answers are x=-9 and x=-4
Those two values of x make on or the other factor equal to zero, so they are solutions.
Use factoring to solve the equation:
x^2+13x+36+0
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