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.
(7 + -2x)(13 + -2x) = 0

Subproblem 1

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

Subproblem 2

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

Solution

x = {3.5, 6.5}

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