(4x-5)(5x+1)=0

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Solution for (4x-5)(5x+1)=0 equation: 


Simplifying
(4x + -5)(5x + 1) = 0

Reorder the terms:
(-5 + 4x)(5x + 1) = 0

Reorder the terms:
(-5 + 4x)(1 + 5x) = 0

Multiply (-5 + 4x) * (1 + 5x)
(-5(1 + 5x) + 4x * (1 + 5x)) = 0
((1 * -5 + 5x * -5) + 4x * (1 + 5x)) = 0
((-5 + -25x) + 4x * (1 + 5x)) = 0
(-5 + -25x + (1 * 4x + 5x * 4x)) = 0
(-5 + -25x + (4x + 20x2)) = 0

Combine like terms: -25x + 4x = -21x
(-5 + -21x + 20x2) = 0

Solving
-5 + -21x + 20x2 = 0

Solving for variable 'x'.

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


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

Simplifying
-1 + -5x = 0

Solving
-1 + -5x = 0

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

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

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

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

Divide each side by '-5'.
x = -0.2

Simplifying
x = -0.2

Subproblem 2
Set the factor '(5 + -4x)' equal to zero and attempt to solve:

Simplifying
5 + -4x = 0

Solving
5 + -4x = 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 + -4x = 0 + -5

Combine like terms: 5 + -5 = 0
0 + -4x = 0 + -5
-4x = 0 + -5

Combine like terms: 0 + -5 = -5
-4x = -5

Divide each side by '-4'.
x = 1.25

Simplifying
x = 1.25
Solution
x = {-0.2, 1.25}

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