5x^2+46x+40=0

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Solution for 5x^2+46x+40=0 equation:


Simplifying
5x2 + 46x + 40 = 0

Reorder the terms:
40 + 46x + 5x2 = 0

Solving
40 + 46x + 5x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
5 the coefficient of the squared term: 

Divide each side by '5'.
8 + 9.2x + x2 = 0

Move the constant term to the right:

Add '-8' to each side of the equation.
8 + 9.2x + -8 + x2 = 0 + -8

Reorder the terms:
8 + -8 + 9.2x + x2 = 0 + -8

Combine like terms: 8 + -8 = 0
0 + 9.2x + x2 = 0 + -8
9.2x + x2 = 0 + -8

Combine like terms: 0 + -8 = -8
9.2x + x2 = -8

The x term is 9.2x.  Take half its coefficient (4.6).
Square it (21.16) and add it to both sides.

Add '21.16' to each side of the equation.
9.2x + 21.16 + x2 = -8 + 21.16

Reorder the terms:
21.16 + 9.2x + x2 = -8 + 21.16

Combine like terms: -8 + 21.16 = 13.16
21.16 + 9.2x + x2 = 13.16

Factor a perfect square on the left side:
(x + 4.6)(x + 4.6) = 13.16

Calculate the square root of the right side: 3.627671429

Break this problem into two subproblems by setting 
(x + 4.6) equal to 3.627671429 and -3.627671429.

Subproblem 1

x + 4.6 = 3.627671429 Simplifying x + 4.6 = 3.627671429 Reorder the terms: 4.6 + x = 3.627671429 Solving 4.6 + x = 3.627671429 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.6' to each side of the equation. 4.6 + -4.6 + x = 3.627671429 + -4.6 Combine like terms: 4.6 + -4.6 = 0.0 0.0 + x = 3.627671429 + -4.6 x = 3.627671429 + -4.6 Combine like terms: 3.627671429 + -4.6 = -0.972328571 x = -0.972328571 Simplifying x = -0.972328571

Subproblem 2

x + 4.6 = -3.627671429 Simplifying x + 4.6 = -3.627671429 Reorder the terms: 4.6 + x = -3.627671429 Solving 4.6 + x = -3.627671429 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.6' to each side of the equation. 4.6 + -4.6 + x = -3.627671429 + -4.6 Combine like terms: 4.6 + -4.6 = 0.0 0.0 + x = -3.627671429 + -4.6 x = -3.627671429 + -4.6 Combine like terms: -3.627671429 + -4.6 = -8.227671429 x = -8.227671429 Simplifying x = -8.227671429

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.972328571, -8.227671429}

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