120=(3x+6)(x+4)

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Solution for 120=(3x+6)(x+4) equation:


Simplifying
120 = (3x + 6)(x + 4)

Reorder the terms:
120 = (6 + 3x)(x + 4)

Reorder the terms:
120 = (6 + 3x)(4 + x)

Multiply (6 + 3x) * (4 + x)
120 = (6(4 + x) + 3x * (4 + x))
120 = ((4 * 6 + x * 6) + 3x * (4 + x))
120 = ((24 + 6x) + 3x * (4 + x))
120 = (24 + 6x + (4 * 3x + x * 3x))
120 = (24 + 6x + (12x + 3x2))

Combine like terms: 6x + 12x = 18x
120 = (24 + 18x + 3x2)

Solving
120 = 24 + 18x + 3x2

Solving for variable 'x'.

Combine like terms: 120 + -24 = 96
96 + -18x + -3x2 = 24 + 18x + 3x2 + -24 + -18x + -3x2

Reorder the terms:
96 + -18x + -3x2 = 24 + -24 + 18x + -18x + 3x2 + -3x2

Combine like terms: 24 + -24 = 0
96 + -18x + -3x2 = 0 + 18x + -18x + 3x2 + -3x2
96 + -18x + -3x2 = 18x + -18x + 3x2 + -3x2

Combine like terms: 18x + -18x = 0
96 + -18x + -3x2 = 0 + 3x2 + -3x2
96 + -18x + -3x2 = 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
96 + -18x + -3x2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(32 + -6x + -1x2) = 0

Ignore the factor 3.

Subproblem 1

Set the factor '(32 + -6x + -1x2)' equal to zero and attempt to solve: Simplifying 32 + -6x + -1x2 = 0 Solving 32 + -6x + -1x2 = 0 Begin completing the square. Divide all terms by -1 the coefficient of the squared term: Divide each side by '-1'. -32 + 6x + x2 = 0 Move the constant term to the right: Add '32' to each side of the equation. -32 + 6x + 32 + x2 = 0 + 32 Reorder the terms: -32 + 32 + 6x + x2 = 0 + 32 Combine like terms: -32 + 32 = 0 0 + 6x + x2 = 0 + 32 6x + x2 = 0 + 32 Combine like terms: 0 + 32 = 32 6x + x2 = 32 The x term is 6x. Take half its coefficient (3). Square it (9) and add it to both sides. Add '9' to each side of the equation. 6x + 9 + x2 = 32 + 9 Reorder the terms: 9 + 6x + x2 = 32 + 9 Combine like terms: 32 + 9 = 41 9 + 6x + x2 = 41 Factor a perfect square on the left side: (x + 3)(x + 3) = 41 Calculate the square root of the right side: 6.403124237 Break this problem into two subproblems by setting (x + 3) equal to 6.403124237 and -6.403124237.

Subproblem 1

x + 3 = 6.403124237 Simplifying x + 3 = 6.403124237 Reorder the terms: 3 + x = 6.403124237 Solving 3 + x = 6.403124237 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 6.403124237 + -3 Combine like terms: 3 + -3 = 0 0 + x = 6.403124237 + -3 x = 6.403124237 + -3 Combine like terms: 6.403124237 + -3 = 3.403124237 x = 3.403124237 Simplifying x = 3.403124237

Subproblem 2

x + 3 = -6.403124237 Simplifying x + 3 = -6.403124237 Reorder the terms: 3 + x = -6.403124237 Solving 3 + x = -6.403124237 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -6.403124237 + -3 Combine like terms: 3 + -3 = 0 0 + x = -6.403124237 + -3 x = -6.403124237 + -3 Combine like terms: -6.403124237 + -3 = -9.403124237 x = -9.403124237 Simplifying x = -9.403124237

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.403124237, -9.403124237}

Solution

x = {3.403124237, -9.403124237}

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