4x^2+40x=-91

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Solution for 4x^2+40x=-91 equation:


Simplifying
4x2 + 40x = -91

Reorder the terms:
40x + 4x2 = -91

Solving
40x + 4x2 = -91

Solving for variable 'x'.

Reorder the terms:
91 + 40x + 4x2 = -91 + 91

Combine like terms: -91 + 91 = 0
91 + 40x + 4x2 = 0

Factor a trinomial.
(13 + 2x)(7 + 2x) = 0

Subproblem 1

Set the factor '(13 + 2x)' equal to zero and attempt to solve: Simplifying 13 + 2x = 0 Solving 13 + 2x = 0 Move all terms containing x to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + 2x = 0 + -13 Combine like terms: 13 + -13 = 0 0 + 2x = 0 + -13 2x = 0 + -13 Combine like terms: 0 + -13 = -13 2x = -13 Divide each side by '2'. x = -6.5 Simplifying x = -6.5

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 = {-6.5, -3.5}

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