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

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


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

Reorder the terms:
x(4 + x) = 4(5 + -1x)
(4 * x + x * x) = 4(5 + -1x)
(4x + x2) = 4(5 + -1x)
4x + x2 = (5 * 4 + -1x * 4)
4x + x2 = (20 + -4x)

Solving
4x + x2 = 20 + -4x

Solving for variable 'x'.

Reorder the terms:
-20 + 4x + 4x + x2 = 20 + -4x + -20 + 4x

Combine like terms: 4x + 4x = 8x
-20 + 8x + x2 = 20 + -4x + -20 + 4x

Reorder the terms:
-20 + 8x + x2 = 20 + -20 + -4x + 4x

Combine like terms: 20 + -20 = 0
-20 + 8x + x2 = 0 + -4x + 4x
-20 + 8x + x2 = -4x + 4x

Combine like terms: -4x + 4x = 0
-20 + 8x + x2 = 0

Factor a trinomial.
(-10 + -1x)(2 + -1x) = 0

Subproblem 1

Set the factor '(-10 + -1x)' equal to zero and attempt to solve: Simplifying -10 + -1x = 0 Solving -10 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + -1x = 0 + 10 Combine like terms: -10 + 10 = 0 0 + -1x = 0 + 10 -1x = 0 + 10 Combine like terms: 0 + 10 = 10 -1x = 10 Divide each side by '-1'. x = -10 Simplifying x = -10

Subproblem 2

Set the factor '(2 + -1x)' equal to zero and attempt to solve: Simplifying 2 + -1x = 0 Solving 2 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + -1x = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -1x = 0 + -2 -1x = 0 + -2 Combine like terms: 0 + -2 = -2 -1x = -2 Divide each side by '-1'. x = 2 Simplifying x = 2

Solution

x = {-10, 2}

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