3x^2+7x=40

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Solution for 3x^2+7x=40 equation:


Simplifying
3x2 + 7x = 40

Reorder the terms:
7x + 3x2 = 40

Solving
7x + 3x2 = 40

Solving for variable 'x'.

Reorder the terms:
-40 + 7x + 3x2 = 40 + -40

Combine like terms: 40 + -40 = 0
-40 + 7x + 3x2 = 0

Factor a trinomial.
(-5 + -1x)(8 + -3x) = 0

Subproblem 1

Set the factor '(-5 + -1x)' equal to zero and attempt to solve: Simplifying -5 + -1x = 0 Solving -5 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + -1x = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -1x = 0 + 5 -1x = 0 + 5 Combine like terms: 0 + 5 = 5 -1x = 5 Divide each side by '-1'. x = -5 Simplifying x = -5

Subproblem 2

Set the factor '(8 + -3x)' equal to zero and attempt to solve: Simplifying 8 + -3x = 0 Solving 8 + -3x = 0 Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + -3x = 0 + -8 Combine like terms: 8 + -8 = 0 0 + -3x = 0 + -8 -3x = 0 + -8 Combine like terms: 0 + -8 = -8 -3x = -8 Divide each side by '-3'. x = 2.666666667 Simplifying x = 2.666666667

Solution

x = {-5, 2.666666667}

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