(x+4)(5x-2)=0

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Solution for (x+4)(5x-2)=0 equation: 


Simplifying
(x + 4)(5x + -2) = 0

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

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

Multiply (4 + x) * (-2 + 5x)
(4(-2 + 5x) + x(-2 + 5x)) = 0
((-2 * 4 + 5x * 4) + x(-2 + 5x)) = 0
((-8 + 20x) + x(-2 + 5x)) = 0
(-8 + 20x + (-2 * x + 5x * x)) = 0
(-8 + 20x + (-2x + 5x2)) = 0

Combine like terms: 20x + -2x = 18x
(-8 + 18x + 5x2) = 0

Solving
-8 + 18x + 5x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-4 + -1x)(2 + -5x) = 0


Subproblem 1
Set the factor '(-4 + -1x)' equal to zero and attempt to solve:

Simplifying
-4 + -1x = 0

Solving
-4 + -1x = 0

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

Add '4' to each side of the equation.
-4 + 4 + -1x = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -1x = 0 + 4
-1x = 0 + 4

Combine like terms: 0 + 4 = 4
-1x = 4

Divide each side by '-1'.
x = -4

Simplifying
x = -4

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

Simplifying
2 + -5x = 0

Solving
2 + -5x = 0

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

Add '-2' to each side of the equation.
2 + -2 + -5x = 0 + -2

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

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

Divide each side by '-5'.
x = 0.4

Simplifying
x = 0.4
Solution
x = {-4, 0.4}

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