5x^2+40x+5=4x

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Solution for 5x^2+40x+5=4x equation:


Simplifying
5x2 + 40x + 5 = 4x

Reorder the terms:
5 + 40x + 5x2 = 4x

Solving
5 + 40x + 5x2 = 4x

Solving for variable 'x'.

Reorder the terms:
5 + 40x + -4x + 5x2 = 4x + -4x

Combine like terms: 40x + -4x = 36x
5 + 36x + 5x2 = 4x + -4x

Combine like terms: 4x + -4x = 0
5 + 36x + 5x2 = 0

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

Divide each side by '5'.
1 + 7.2x + x2 = 0

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + 7.2x + -1 + x2 = 0 + -1

Reorder the terms:
1 + -1 + 7.2x + x2 = 0 + -1

Combine like terms: 1 + -1 = 0
0 + 7.2x + x2 = 0 + -1
7.2x + x2 = 0 + -1

Combine like terms: 0 + -1 = -1
7.2x + x2 = -1

The x term is 7.2x.  Take half its coefficient (3.6).
Square it (12.96) and add it to both sides.

Add '12.96' to each side of the equation.
7.2x + 12.96 + x2 = -1 + 12.96

Reorder the terms:
12.96 + 7.2x + x2 = -1 + 12.96

Combine like terms: -1 + 12.96 = 11.96
12.96 + 7.2x + x2 = 11.96

Factor a perfect square on the left side:
(x + 3.6)(x + 3.6) = 11.96

Calculate the square root of the right side: 3.458323293

Break this problem into two subproblems by setting 
(x + 3.6) equal to 3.458323293 and -3.458323293.

Subproblem 1

x + 3.6 = 3.458323293 Simplifying x + 3.6 = 3.458323293 Reorder the terms: 3.6 + x = 3.458323293 Solving 3.6 + x = 3.458323293 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.6' to each side of the equation. 3.6 + -3.6 + x = 3.458323293 + -3.6 Combine like terms: 3.6 + -3.6 = 0.0 0.0 + x = 3.458323293 + -3.6 x = 3.458323293 + -3.6 Combine like terms: 3.458323293 + -3.6 = -0.141676707 x = -0.141676707 Simplifying x = -0.141676707

Subproblem 2

x + 3.6 = -3.458323293 Simplifying x + 3.6 = -3.458323293 Reorder the terms: 3.6 + x = -3.458323293 Solving 3.6 + x = -3.458323293 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.6' to each side of the equation. 3.6 + -3.6 + x = -3.458323293 + -3.6 Combine like terms: 3.6 + -3.6 = 0.0 0.0 + x = -3.458323293 + -3.6 x = -3.458323293 + -3.6 Combine like terms: -3.458323293 + -3.6 = -7.058323293 x = -7.058323293 Simplifying x = -7.058323293

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.141676707, -7.058323293}

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