(x+3)*(x-6)=x*x-39

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Solution for (x+3)*(x-6)=x*x-39 equation:


Simplifying
(x + 3)(x + -6) = x * x + -39

Reorder the terms:
(3 + x)(x + -6) = x * x + -39

Reorder the terms:
(3 + x)(-6 + x) = x * x + -39

Multiply (3 + x) * (-6 + x)
(3(-6 + x) + x(-6 + x)) = x * x + -39
((-6 * 3 + x * 3) + x(-6 + x)) = x * x + -39
((-18 + 3x) + x(-6 + x)) = x * x + -39
(-18 + 3x + (-6 * x + x * x)) = x * x + -39
(-18 + 3x + (-6x + x2)) = x * x + -39

Combine like terms: 3x + -6x = -3x
(-18 + -3x + x2) = x * x + -39

Multiply x * x
-18 + -3x + x2 = x2 + -39

Reorder the terms:
-18 + -3x + x2 = -39 + x2

Add '-1x2' to each side of the equation.
-18 + -3x + x2 + -1x2 = -39 + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-18 + -3x + 0 = -39 + x2 + -1x2
-18 + -3x = -39 + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-18 + -3x = -39 + 0
-18 + -3x = -39

Solving
-18 + -3x = -39

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '18' to each side of the equation.
-18 + 18 + -3x = -39 + 18

Combine like terms: -18 + 18 = 0
0 + -3x = -39 + 18
-3x = -39 + 18

Combine like terms: -39 + 18 = -21
-3x = -21

Divide each side by '-3'.
x = 7

Simplifying
x = 7

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