x^2+.4x=62

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Solution for x^2+.4x=62 equation:


Simplifying
x2 + 0.4x = 62

Reorder the terms:
0.4x + x2 = 62

Solving
0.4x + x2 = 62

Solving for variable 'x'.

Reorder the terms:
-62 + 0.4x + x2 = 62 + -62

Combine like terms: 62 + -62 = 0
-62 + 0.4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '62' to each side of the equation.
-62 + 0.4x + 62 + x2 = 0 + 62

Reorder the terms:
-62 + 62 + 0.4x + x2 = 0 + 62

Combine like terms: -62 + 62 = 0
0 + 0.4x + x2 = 0 + 62
0.4x + x2 = 0 + 62

Combine like terms: 0 + 62 = 62
0.4x + x2 = 62

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 = 62 + 0.04

Reorder the terms:
0.04 + 0.4x + x2 = 62 + 0.04

Combine like terms: 62 + 0.04 = 62.04
0.04 + 0.4x + x2 = 62.04

Factor a perfect square on the left side:
(x + 0.2)(x + 0.2) = 62.04

Calculate the square root of the right side: 7.876547467

Break this problem into two subproblems by setting 
(x + 0.2) equal to 7.876547467 and -7.876547467.

Subproblem 1

x + 0.2 = 7.876547467 Simplifying x + 0.2 = 7.876547467 Reorder the terms: 0.2 + x = 7.876547467 Solving 0.2 + x = 7.876547467 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 = 7.876547467 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + x = 7.876547467 + -0.2 x = 7.876547467 + -0.2 Combine like terms: 7.876547467 + -0.2 = 7.676547467 x = 7.676547467 Simplifying x = 7.676547467

Subproblem 2

x + 0.2 = -7.876547467 Simplifying x + 0.2 = -7.876547467 Reorder the terms: 0.2 + x = -7.876547467 Solving 0.2 + x = -7.876547467 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 = -7.876547467 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + x = -7.876547467 + -0.2 x = -7.876547467 + -0.2 Combine like terms: -7.876547467 + -0.2 = -8.076547467 x = -8.076547467 Simplifying x = -8.076547467

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.676547467, -8.076547467}

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