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

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


Simplifying
(4 + -1x)(2x + 5) = 0

Reorder the terms:
(4 + -1x)(5 + 2x) = 0

Multiply (4 + -1x) * (5 + 2x)
(4(5 + 2x) + -1x * (5 + 2x)) = 0
((5 * 4 + 2x * 4) + -1x * (5 + 2x)) = 0
((20 + 8x) + -1x * (5 + 2x)) = 0
(20 + 8x + (5 * -1x + 2x * -1x)) = 0
(20 + 8x + (-5x + -2x2)) = 0

Combine like terms: 8x + -5x = 3x
(20 + 3x + -2x2) = 0

Solving
20 + 3x + -2x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(4 + -1x)(5 + 2x) = 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 '(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
Solution
x = {4, -2.5}

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