x(5x+2)=4

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Solution for x(5x+2)=4 equation:


Simplifying
x(5x + 2) = 4

Reorder the terms:
x(2 + 5x) = 4
(2 * x + 5x * x) = 4
(2x + 5x2) = 4

Solving
2x + 5x2 = 4

Solving for variable 'x'.

Reorder the terms:
-4 + 2x + 5x2 = 4 + -4

Combine like terms: 4 + -4 = 0
-4 + 2x + 5x2 = 0

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

Divide each side by '5'.
-0.8 + 0.4x + x2 = 0

Move the constant term to the right:

Add '0.8' to each side of the equation.
-0.8 + 0.4x + 0.8 + x2 = 0 + 0.8

Reorder the terms:
-0.8 + 0.8 + 0.4x + x2 = 0 + 0.8

Combine like terms: -0.8 + 0.8 = 0.0
0.0 + 0.4x + x2 = 0 + 0.8
0.4x + x2 = 0 + 0.8

Combine like terms: 0 + 0.8 = 0.8
0.4x + x2 = 0.8

The x term is 0.4x.  Take half its coefficient (0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
0.4x + 0.04 + x2 = 0.8 + 0.04

Reorder the terms:
0.04 + 0.4x + x2 = 0.8 + 0.04

Combine like terms: 0.8 + 0.04 = 0.84
0.04 + 0.4x + x2 = 0.84

Factor a perfect square on the left side:
(x + 0.2)(x + 0.2) = 0.84

Calculate the square root of the right side: 0.916515139

Break this problem into two subproblems by setting 
(x + 0.2) equal to 0.916515139 and -0.916515139.

Subproblem 1

x + 0.2 = 0.916515139 Simplifying x + 0.2 = 0.916515139 Reorder the terms: 0.2 + x = 0.916515139 Solving 0.2 + x = 0.916515139 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2' to each side of the equation. 0.2 + -0.2 + x = 0.916515139 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + x = 0.916515139 + -0.2 x = 0.916515139 + -0.2 Combine like terms: 0.916515139 + -0.2 = 0.716515139 x = 0.716515139 Simplifying x = 0.716515139

Subproblem 2

x + 0.2 = -0.916515139 Simplifying x + 0.2 = -0.916515139 Reorder the terms: 0.2 + x = -0.916515139 Solving 0.2 + x = -0.916515139 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2' to each side of the equation. 0.2 + -0.2 + x = -0.916515139 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + x = -0.916515139 + -0.2 x = -0.916515139 + -0.2 Combine like terms: -0.916515139 + -0.2 = -1.116515139 x = -1.116515139 Simplifying x = -1.116515139

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.716515139, -1.116515139}

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