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

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


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

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

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

Solving
20 + -3x + -2x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(5 + -2x)(4 + x) = 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 '(4 + x)' equal to zero and attempt to solve: Simplifying 4 + x = 0 Solving 4 + x = 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 + x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + x = 0 + -4 x = 0 + -4 Combine like terms: 0 + -4 = -4 x = -4 Simplifying x = -4

Solution

x = {2.5, -4}

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