(x-8)(2x+5)=0

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Solution for (x-8)(2x+5)=0 equation: 


Simplifying
(x + -8)(2x + 5) = 0

Reorder the terms:
(-8 + x)(2x + 5) = 0

Reorder the terms:
(-8 + x)(5 + 2x) = 0

Multiply (-8 + x) * (5 + 2x)
(-8(5 + 2x) + x(5 + 2x)) = 0
((5 * -8 + 2x * -8) + x(5 + 2x)) = 0
((-40 + -16x) + x(5 + 2x)) = 0
(-40 + -16x + (5 * x + 2x * x)) = 0
(-40 + -16x + (5x + 2x2)) = 0

Combine like terms: -16x + 5x = -11x
(-40 + -11x + 2x2) = 0

Solving
-40 + -11x + 2x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-5 + -2x)(8 + -1x) = 0


Subproblem 1
Set the factor '(-5 + -2x)' equal to zero and attempt to solve:

Simplifying
-5 + -2x = 0

Solving
-5 + -2x = 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 + -2x = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -2x = 0 + 5
-2x = 0 + 5

Combine like terms: 0 + 5 = 5
-2x = 5

Divide each side by '-2'.
x = -2.5

Simplifying
x = -2.5

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 = {-2.5, 8}

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