X*X-4*X-15=0

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Solution for X*X-4*X-15=0 equation:


x*x-4*x-15=0

We simplify the equation to the form, which is simple to understand 
x*x-4*x-15=0

We move all terms containing x to the left and all other terms to the right. 
+1x-4x=0+15

We simplify left and right side of the equation. 
-3x=+15

We divide both sides of the equation by -3 to get x. 
x=-5

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