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

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


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

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

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

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

Combine like terms: -4x + 5x = 1x
(-4 + 1x + 5x2) = 0

Solving
-4 + 1x + 5x2 = 0

Solving for variable 'x'.

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


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

Simplifying
-1 + -1x = 0

Solving
-1 + -1x = 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 + -1x = 0 + 1

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

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

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

Simplifying
x = -1

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

Simplifying
4 + -5x = 0

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

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

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

Divide each side by '-5'.
x = 0.8

Simplifying
x = 0.8
Solution
x = {-1, 0.8}

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