10x^2+3x=0.4

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Solution for 10x^2+3x=0.4 equation:


Simplifying
10x2 + 3x = 0.4

Reorder the terms:
3x + 10x2 = 0.4

Solving
3x + 10x2 = 0.4

Solving for variable 'x'.

Reorder the terms:
-0.4 + 3x + 10x2 = 0.4 + -0.4

Combine like terms: 0.4 + -0.4 = 0.0
-0.4 + 3x + 10x2 = 0.0

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

Divide each side by '10'.
-0.04 + 0.3x + x2 = 0.0

Move the constant term to the right:

Add '0.04' to each side of the equation.
-0.04 + 0.3x + 0.04 + x2 = 0.0 + 0.04

Reorder the terms:
-0.04 + 0.04 + 0.3x + x2 = 0.0 + 0.04

Combine like terms: -0.04 + 0.04 = 0.00
0.00 + 0.3x + x2 = 0.0 + 0.04
0.3x + x2 = 0.0 + 0.04

Combine like terms: 0.0 + 0.04 = 0.04
0.3x + x2 = 0.04

The x term is 0.3x.  Take half its coefficient (0.15).
Square it (0.0225) and add it to both sides.

Add '0.0225' to each side of the equation.
0.3x + 0.0225 + x2 = 0.04 + 0.0225

Reorder the terms:
0.0225 + 0.3x + x2 = 0.04 + 0.0225

Combine like terms: 0.04 + 0.0225 = 0.0625
0.0225 + 0.3x + x2 = 0.0625

Factor a perfect square on the left side:
(x + 0.15)(x + 0.15) = 0.0625

Calculate the square root of the right side: 0.25

Break this problem into two subproblems by setting 
(x + 0.15) equal to 0.25 and -0.25.

Subproblem 1

x + 0.15 = 0.25 Simplifying x + 0.15 = 0.25 Reorder the terms: 0.15 + x = 0.25 Solving 0.15 + x = 0.25 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.15' to each side of the equation. 0.15 + -0.15 + x = 0.25 + -0.15 Combine like terms: 0.15 + -0.15 = 0.00 0.00 + x = 0.25 + -0.15 x = 0.25 + -0.15 Combine like terms: 0.25 + -0.15 = 0.1 x = 0.1 Simplifying x = 0.1

Subproblem 2

x + 0.15 = -0.25 Simplifying x + 0.15 = -0.25 Reorder the terms: 0.15 + x = -0.25 Solving 0.15 + x = -0.25 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.15' to each side of the equation. 0.15 + -0.15 + x = -0.25 + -0.15 Combine like terms: 0.15 + -0.15 = 0.00 0.00 + x = -0.25 + -0.15 x = -0.25 + -0.15 Combine like terms: -0.25 + -0.15 = -0.4 x = -0.4 Simplifying x = -0.4

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.1, -0.4}

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