x(x+1)=3(4-x)

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Solution for x(x+1)=3(4-x) equation:


Simplifying
x(x + 1) = 3(4 + -1x)

Reorder the terms:
x(1 + x) = 3(4 + -1x)
(1 * x + x * x) = 3(4 + -1x)
(1x + x2) = 3(4 + -1x)
1x + x2 = (4 * 3 + -1x * 3)
1x + x2 = (12 + -3x)

Solving
1x + x2 = 12 + -3x

Solving for variable 'x'.

Reorder the terms:
-12 + 1x + 3x + x2 = 12 + -3x + -12 + 3x

Combine like terms: 1x + 3x = 4x
-12 + 4x + x2 = 12 + -3x + -12 + 3x

Reorder the terms:
-12 + 4x + x2 = 12 + -12 + -3x + 3x

Combine like terms: 12 + -12 = 0
-12 + 4x + x2 = 0 + -3x + 3x
-12 + 4x + x2 = -3x + 3x

Combine like terms: -3x + 3x = 0
-12 + 4x + x2 = 0

Factor a trinomial.
(-6 + -1x)(2 + -1x) = 0

Subproblem 1

Set the factor '(-6 + -1x)' equal to zero and attempt to solve: Simplifying -6 + -1x = 0 Solving -6 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + -1x = 0 + 6 Combine like terms: -6 + 6 = 0 0 + -1x = 0 + 6 -1x = 0 + 6 Combine like terms: 0 + 6 = 6 -1x = 6 Divide each side by '-1'. x = -6 Simplifying x = -6

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 = {-6, 2}

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