(x+13)(x-7)=0

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Solution for (x+13)(x-7)=0 equation: 


Simplifying
(x + 13)(x + -7) = 0

Reorder the terms:
(13 + x)(x + -7) = 0

Reorder the terms:
(13 + x)(-7 + x) = 0

Multiply (13 + x) * (-7 + x)
(13(-7 + x) + x(-7 + x)) = 0
((-7 * 13 + x * 13) + x(-7 + x)) = 0
((-91 + 13x) + x(-7 + x)) = 0
(-91 + 13x + (-7 * x + x * x)) = 0
(-91 + 13x + (-7x + x2)) = 0

Combine like terms: 13x + -7x = 6x
(-91 + 6x + x2) = 0

Solving
-91 + 6x + x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-13 + -1x)(7 + -1x) = 0


Subproblem 1
Set the factor '(-13 + -1x)' equal to zero and attempt to solve:

Simplifying
-13 + -1x = 0

Solving
-13 + -1x = 0

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

Add '13' to each side of the equation.
-13 + 13 + -1x = 0 + 13

Combine like terms: -13 + 13 = 0
0 + -1x = 0 + 13
-1x = 0 + 13

Combine like terms: 0 + 13 = 13
-1x = 13

Divide each side by '-1'.
x = -13

Simplifying
x = -13

Subproblem 2
Set the factor '(7 + -1x)' equal to zero and attempt to solve:

Simplifying
7 + -1x = 0

Solving
7 + -1x = 0

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

Add '-7' to each side of the equation.
7 + -7 + -1x = 0 + -7

Combine like terms: 7 + -7 = 0
0 + -1x = 0 + -7
-1x = 0 + -7

Combine like terms: 0 + -7 = -7
-1x = -7

Divide each side by '-1'.
x = 7

Simplifying
x = 7
Solution
x = {-13, 7}

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