5x^2+4x=23

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Solution for 5x^2+4x=23 equation:


Simplifying
5x2 + 4x = 23

Reorder the terms:
4x + 5x2 = 23

Solving
4x + 5x2 = 23

Solving for variable 'x'.

Reorder the terms:
-23 + 4x + 5x2 = 23 + -23

Combine like terms: 23 + -23 = 0
-23 + 4x + 5x2 = 0

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

Divide each side by '5'.
-4.6 + 0.8x + x2 = 0

Move the constant term to the right:

Add '4.6' to each side of the equation.
-4.6 + 0.8x + 4.6 + x2 = 0 + 4.6

Reorder the terms:
-4.6 + 4.6 + 0.8x + x2 = 0 + 4.6

Combine like terms: -4.6 + 4.6 = 0.0
0.0 + 0.8x + x2 = 0 + 4.6
0.8x + x2 = 0 + 4.6

Combine like terms: 0 + 4.6 = 4.6
0.8x + x2 = 4.6

The x term is 0.8x.  Take half its coefficient (0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
0.8x + 0.16 + x2 = 4.6 + 0.16

Reorder the terms:
0.16 + 0.8x + x2 = 4.6 + 0.16

Combine like terms: 4.6 + 0.16 = 4.76
0.16 + 0.8x + x2 = 4.76

Factor a perfect square on the left side:
(x + 0.4)(x + 0.4) = 4.76

Calculate the square root of the right side: 2.181742423

Break this problem into two subproblems by setting 
(x + 0.4) equal to 2.181742423 and -2.181742423.

Subproblem 1

x + 0.4 = 2.181742423 Simplifying x + 0.4 = 2.181742423 Reorder the terms: 0.4 + x = 2.181742423 Solving 0.4 + x = 2.181742423 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + x = 2.181742423 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = 2.181742423 + -0.4 x = 2.181742423 + -0.4 Combine like terms: 2.181742423 + -0.4 = 1.781742423 x = 1.781742423 Simplifying x = 1.781742423

Subproblem 2

x + 0.4 = -2.181742423 Simplifying x + 0.4 = -2.181742423 Reorder the terms: 0.4 + x = -2.181742423 Solving 0.4 + x = -2.181742423 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + x = -2.181742423 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = -2.181742423 + -0.4 x = -2.181742423 + -0.4 Combine like terms: -2.181742423 + -0.4 = -2.581742423 x = -2.581742423 Simplifying x = -2.581742423

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.781742423, -2.581742423}

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