2x^2+12x=7x+42

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Solution for 2x^2+12x=7x+42 equation:


Simplifying
2x2 + 12x = 7x + 42

Reorder the terms:
12x + 2x2 = 7x + 42

Reorder the terms:
12x + 2x2 = 42 + 7x

Solving
12x + 2x2 = 42 + 7x

Solving for variable 'x'.

Reorder the terms:
-42 + 12x + -7x + 2x2 = 42 + 7x + -42 + -7x

Combine like terms: 12x + -7x = 5x
-42 + 5x + 2x2 = 42 + 7x + -42 + -7x

Reorder the terms:
-42 + 5x + 2x2 = 42 + -42 + 7x + -7x

Combine like terms: 42 + -42 = 0
-42 + 5x + 2x2 = 0 + 7x + -7x
-42 + 5x + 2x2 = 7x + -7x

Combine like terms: 7x + -7x = 0
-42 + 5x + 2x2 = 0

Factor a trinomial.
(-6 + -1x)(7 + -2x) = 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 '(7 + -2x)' equal to zero and attempt to solve: Simplifying 7 + -2x = 0 Solving 7 + -2x = 0 Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -2x = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -2x = 0 + -7 -2x = 0 + -7 Combine like terms: 0 + -7 = -7 -2x = -7 Divide each side by '-2'. x = 3.5 Simplifying x = 3.5

Solution

x = {-6, 3.5}

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