378=(15+x)(12+x)

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Solution for 378=(15+x)(12+x) equation:


Simplifying
378 = (15 + x)(12 + x)

Multiply (15 + x) * (12 + x)
378 = (15(12 + x) + x(12 + x))
378 = ((12 * 15 + x * 15) + x(12 + x))
378 = ((180 + 15x) + x(12 + x))
378 = (180 + 15x + (12 * x + x * x))
378 = (180 + 15x + (12x + x2))

Combine like terms: 15x + 12x = 27x
378 = (180 + 27x + x2)

Solving
378 = 180 + 27x + x2

Solving for variable 'x'.

Combine like terms: 378 + -180 = 198
198 + -27x + -1x2 = 180 + 27x + x2 + -180 + -27x + -1x2

Reorder the terms:
198 + -27x + -1x2 = 180 + -180 + 27x + -27x + x2 + -1x2

Combine like terms: 180 + -180 = 0
198 + -27x + -1x2 = 0 + 27x + -27x + x2 + -1x2
198 + -27x + -1x2 = 27x + -27x + x2 + -1x2

Combine like terms: 27x + -27x = 0
198 + -27x + -1x2 = 0 + x2 + -1x2
198 + -27x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
198 + -27x + -1x2 = 0

Factor a trinomial.
(6 + -1x)(33 + x) = 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 '(33 + x)' equal to zero and attempt to solve: Simplifying 33 + x = 0 Solving 33 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-33' to each side of the equation. 33 + -33 + x = 0 + -33 Combine like terms: 33 + -33 = 0 0 + x = 0 + -33 x = 0 + -33 Combine like terms: 0 + -33 = -33 x = -33 Simplifying x = -33

Solution

x = {6, -33}

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