(x+5)(x-8)=

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Solution for (x+5)(x-8)= equation: 


Simplifying
(x + 5)(x + -8) = 0

Reorder the terms:
(5 + x)(x + -8) = 0

Reorder the terms:
(5 + x)(-8 + x) = 0

Multiply (5 + x) * (-8 + x)
(5(-8 + x) + x(-8 + x)) = 0
((-8 * 5 + x * 5) + x(-8 + x)) = 0
((-40 + 5x) + x(-8 + x)) = 0
(-40 + 5x + (-8 * x + x * x)) = 0
(-40 + 5x + (-8x + x2)) = 0

Combine like terms: 5x + -8x = -3x
(-40 + -3x + x2) = 0

Solving
-40 + -3x + x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-5 + -1x)(8 + -1x) = 0


Subproblem 1
Set the factor '(-5 + -1x)' equal to zero and attempt to solve:

Simplifying
-5 + -1x = 0

Solving
-5 + -1x = 0

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

Add '5' to each side of the equation.
-5 + 5 + -1x = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -1x = 0 + 5
-1x = 0 + 5

Combine like terms: 0 + 5 = 5
-1x = 5

Divide each side by '-1'.
x = -5

Simplifying
x = -5

Subproblem 2
Set the factor '(8 + -1x)' equal to zero and attempt to solve:

Simplifying
8 + -1x = 0

Solving
8 + -1x = 0

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

Add '-8' to each side of the equation.
8 + -8 + -1x = 0 + -8

Combine like terms: 8 + -8 = 0
0 + -1x = 0 + -8
-1x = 0 + -8

Combine like terms: 0 + -8 = -8
-1x = -8

Divide each side by '-1'.
x = 8

Simplifying
x = 8
Solution
x = {-5, 8}

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