5x^2+8x-46=0

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Solution for 5x^2+8x-46=0 equation:


Simplifying
5x2 + 8x + -46 = 0

Reorder the terms:
-46 + 8x + 5x2 = 0

Solving
-46 + 8x + 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'.
-9.2 + 1.6x + x2 = 0

Move the constant term to the right:

Add '9.2' to each side of the equation.
-9.2 + 1.6x + 9.2 + x2 = 0 + 9.2

Reorder the terms:
-9.2 + 9.2 + 1.6x + x2 = 0 + 9.2

Combine like terms: -9.2 + 9.2 = 0.0
0.0 + 1.6x + x2 = 0 + 9.2
1.6x + x2 = 0 + 9.2

Combine like terms: 0 + 9.2 = 9.2
1.6x + x2 = 9.2

The x term is 1.6x.  Take half its coefficient (0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
1.6x + 0.64 + x2 = 9.2 + 0.64

Reorder the terms:
0.64 + 1.6x + x2 = 9.2 + 0.64

Combine like terms: 9.2 + 0.64 = 9.84
0.64 + 1.6x + x2 = 9.84

Factor a perfect square on the left side:
(x + 0.8)(x + 0.8) = 9.84

Calculate the square root of the right side: 3.136877428

Break this problem into two subproblems by setting 
(x + 0.8) equal to 3.136877428 and -3.136877428.

Subproblem 1

x + 0.8 = 3.136877428 Simplifying x + 0.8 = 3.136877428 Reorder the terms: 0.8 + x = 3.136877428 Solving 0.8 + x = 3.136877428 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8' to each side of the equation. 0.8 + -0.8 + x = 3.136877428 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + x = 3.136877428 + -0.8 x = 3.136877428 + -0.8 Combine like terms: 3.136877428 + -0.8 = 2.336877428 x = 2.336877428 Simplifying x = 2.336877428

Subproblem 2

x + 0.8 = -3.136877428 Simplifying x + 0.8 = -3.136877428 Reorder the terms: 0.8 + x = -3.136877428 Solving 0.8 + x = -3.136877428 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8' to each side of the equation. 0.8 + -0.8 + x = -3.136877428 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + x = -3.136877428 + -0.8 x = -3.136877428 + -0.8 Combine like terms: -3.136877428 + -0.8 = -3.936877428 x = -3.936877428 Simplifying x = -3.936877428

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.336877428, -3.936877428}

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