.4-x-5x^2=0

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Solution for .4-x-5x^2=0 equation:


Simplifying
0.4 + -1x + -5x2 = 0

Solving
0.4 + -1x + -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'.
-0.08 + 0.2x + x2 = 0

Move the constant term to the right:

Add '0.08' to each side of the equation.
-0.08 + 0.2x + 0.08 + x2 = 0 + 0.08

Reorder the terms:
-0.08 + 0.08 + 0.2x + x2 = 0 + 0.08

Combine like terms: -0.08 + 0.08 = 0.00
0.00 + 0.2x + x2 = 0 + 0.08
0.2x + x2 = 0 + 0.08

Combine like terms: 0 + 0.08 = 0.08
0.2x + x2 = 0.08

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 = 0.08 + 0.01

Reorder the terms:
0.01 + 0.2x + x2 = 0.08 + 0.01

Combine like terms: 0.08 + 0.01 = 0.09
0.01 + 0.2x + x2 = 0.09

Factor a perfect square on the left side:
(x + 0.1)(x + 0.1) = 0.09

Calculate the square root of the right side: 0.3

Break this problem into two subproblems by setting 
(x + 0.1) equal to 0.3 and -0.3.

Subproblem 1

x + 0.1 = 0.3 Simplifying x + 0.1 = 0.3 Reorder the terms: 0.1 + x = 0.3 Solving 0.1 + x = 0.3 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 = 0.3 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + x = 0.3 + -0.1 x = 0.3 + -0.1 Combine like terms: 0.3 + -0.1 = 0.2 x = 0.2 Simplifying x = 0.2

Subproblem 2

x + 0.1 = -0.3 Simplifying x + 0.1 = -0.3 Reorder the terms: 0.1 + x = -0.3 Solving 0.1 + x = -0.3 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 = -0.3 + -0.1 Combine like terms: 0.1 + -0.1 = 0.0 0.0 + x = -0.3 + -0.1 x = -0.3 + -0.1 Combine like terms: -0.3 + -0.1 = -0.4 x = -0.4 Simplifying x = -0.4

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.2, -0.4}

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