5x(x+0.4)=2x+x+14

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Solution for 5x(x+0.4)=2x+x+14 equation:


Simplifying
5x(x + 0.4) = 2x + x + 14

Reorder the terms:
5x(0.4 + x) = 2x + x + 14
(0.4 * 5x + x * 5x) = 2x + x + 14
(2x + 5x2) = 2x + x + 14

Reorder the terms:
2x + 5x2 = 14 + 2x + x

Combine like terms: 2x + x = 3x
2x + 5x2 = 14 + 3x

Solving
2x + 5x2 = 14 + 3x

Solving for variable 'x'.

Reorder the terms:
-14 + 2x + -3x + 5x2 = 14 + 3x + -14 + -3x

Combine like terms: 2x + -3x = -1x
-14 + -1x + 5x2 = 14 + 3x + -14 + -3x

Reorder the terms:
-14 + -1x + 5x2 = 14 + -14 + 3x + -3x

Combine like terms: 14 + -14 = 0
-14 + -1x + 5x2 = 0 + 3x + -3x
-14 + -1x + 5x2 = 3x + -3x

Combine like terms: 3x + -3x = 0
-14 + -1x + 5x2 = 0

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

Divide each side by '5'.
-2.8 + -0.2x + x2 = 0

Move the constant term to the right:

Add '2.8' to each side of the equation.
-2.8 + -0.2x + 2.8 + x2 = 0 + 2.8

Reorder the terms:
-2.8 + 2.8 + -0.2x + x2 = 0 + 2.8

Combine like terms: -2.8 + 2.8 = 0.0
0.0 + -0.2x + x2 = 0 + 2.8
-0.2x + x2 = 0 + 2.8

Combine like terms: 0 + 2.8 = 2.8
-0.2x + x2 = 2.8

The x term is -0.2x.  Take half its coefficient (-0.1).
Square it (0.01) and add it to both sides.

Add '0.01' to each side of the equation.
-0.2x + 0.01 + x2 = 2.8 + 0.01

Reorder the terms:
0.01 + -0.2x + x2 = 2.8 + 0.01

Combine like terms: 2.8 + 0.01 = 2.81
0.01 + -0.2x + x2 = 2.81

Factor a perfect square on the left side:
(x + -0.1)(x + -0.1) = 2.81

Calculate the square root of the right side: 1.676305461

Break this problem into two subproblems by setting 
(x + -0.1) equal to 1.676305461 and -1.676305461.

Subproblem 1

x + -0.1 = 1.676305461 Simplifying x + -0.1 = 1.676305461 Reorder the terms: -0.1 + x = 1.676305461 Solving -0.1 + x = 1.676305461 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1' to each side of the equation. -0.1 + 0.1 + x = 1.676305461 + 0.1 Combine like terms: -0.1 + 0.1 = 0.0 0.0 + x = 1.676305461 + 0.1 x = 1.676305461 + 0.1 Combine like terms: 1.676305461 + 0.1 = 1.776305461 x = 1.776305461 Simplifying x = 1.776305461

Subproblem 2

x + -0.1 = -1.676305461 Simplifying x + -0.1 = -1.676305461 Reorder the terms: -0.1 + x = -1.676305461 Solving -0.1 + x = -1.676305461 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1' to each side of the equation. -0.1 + 0.1 + x = -1.676305461 + 0.1 Combine like terms: -0.1 + 0.1 = 0.0 0.0 + x = -1.676305461 + 0.1 x = -1.676305461 + 0.1 Combine like terms: -1.676305461 + 0.1 = -1.576305461 x = -1.576305461 Simplifying x = -1.576305461

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.776305461, -1.576305461}

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