456=(20+2x)(15+2x)

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Solution for 456=(20+2x)(15+2x) equation:


Simplifying
456 = (20 + 2x)(15 + 2x)

Multiply (20 + 2x) * (15 + 2x)
456 = (20(15 + 2x) + 2x * (15 + 2x))
456 = ((15 * 20 + 2x * 20) + 2x * (15 + 2x))
456 = ((300 + 40x) + 2x * (15 + 2x))
456 = (300 + 40x + (15 * 2x + 2x * 2x))
456 = (300 + 40x + (30x + 4x2))

Combine like terms: 40x + 30x = 70x
456 = (300 + 70x + 4x2)

Solving
456 = 300 + 70x + 4x2

Solving for variable 'x'.

Combine like terms: 456 + -300 = 156
156 + -70x + -4x2 = 300 + 70x + 4x2 + -300 + -70x + -4x2

Reorder the terms:
156 + -70x + -4x2 = 300 + -300 + 70x + -70x + 4x2 + -4x2

Combine like terms: 300 + -300 = 0
156 + -70x + -4x2 = 0 + 70x + -70x + 4x2 + -4x2
156 + -70x + -4x2 = 70x + -70x + 4x2 + -4x2

Combine like terms: 70x + -70x = 0
156 + -70x + -4x2 = 0 + 4x2 + -4x2
156 + -70x + -4x2 = 4x2 + -4x2

Combine like terms: 4x2 + -4x2 = 0
156 + -70x + -4x2 = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(78 + -35x + -2x2) = 0

Factor a trinomial.
2((2 + -1x)(39 + 2x)) = 0

Ignore the factor 2.

Subproblem 1

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

Subproblem 2

Set the factor '(39 + 2x)' equal to zero and attempt to solve: Simplifying 39 + 2x = 0 Solving 39 + 2x = 0 Move all terms containing x to the left, all other terms to the right. Add '-39' to each side of the equation. 39 + -39 + 2x = 0 + -39 Combine like terms: 39 + -39 = 0 0 + 2x = 0 + -39 2x = 0 + -39 Combine like terms: 0 + -39 = -39 2x = -39 Divide each side by '2'. x = -19.5 Simplifying x = -19.5

Solution

x = {2, -19.5}

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