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

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


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

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

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

Combine like terms: -5x + 4x = -1x
(20 + -1x + -1x2) = 0

Solving
20 + -1x + -1x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(4 + -1x)(5 + x) = 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 + x)' equal to zero and attempt to solve: Simplifying 5 + x = 0 Solving 5 + x = 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 + x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + x = 0 + -5 x = 0 + -5 Combine like terms: 0 + -5 = -5 x = -5 Simplifying x = -5

Solution

x = {4, -5}

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