5x^2+2x=195

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Solution for 5x^2+2x=195 equation:


Simplifying
5x2 + 2x = 195

Reorder the terms:
2x + 5x2 = 195

Solving
2x + 5x2 = 195

Solving for variable 'x'.

Reorder the terms:
-195 + 2x + 5x2 = 195 + -195

Combine like terms: 195 + -195 = 0
-195 + 2x + 5x2 = 0

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

Divide each side by '5'.
-39 + 0.4x + x2 = 0

Move the constant term to the right:

Add '39' to each side of the equation.
-39 + 0.4x + 39 + x2 = 0 + 39

Reorder the terms:
-39 + 39 + 0.4x + x2 = 0 + 39

Combine like terms: -39 + 39 = 0
0 + 0.4x + x2 = 0 + 39
0.4x + x2 = 0 + 39

Combine like terms: 0 + 39 = 39
0.4x + x2 = 39

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 = 39 + 0.04

Reorder the terms:
0.04 + 0.4x + x2 = 39 + 0.04

Combine like terms: 39 + 0.04 = 39.04
0.04 + 0.4x + x2 = 39.04

Factor a perfect square on the left side:
(x + 0.2)(x + 0.2) = 39.04

Calculate the square root of the right side: 6.248199741

Break this problem into two subproblems by setting 
(x + 0.2) equal to 6.248199741 and -6.248199741.

Subproblem 1

x + 0.2 = 6.248199741 Simplifying x + 0.2 = 6.248199741 Reorder the terms: 0.2 + x = 6.248199741 Solving 0.2 + x = 6.248199741 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 = 6.248199741 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + x = 6.248199741 + -0.2 x = 6.248199741 + -0.2 Combine like terms: 6.248199741 + -0.2 = 6.048199741 x = 6.048199741 Simplifying x = 6.048199741

Subproblem 2

x + 0.2 = -6.248199741 Simplifying x + 0.2 = -6.248199741 Reorder the terms: 0.2 + x = -6.248199741 Solving 0.2 + x = -6.248199741 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 = -6.248199741 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + x = -6.248199741 + -0.2 x = -6.248199741 + -0.2 Combine like terms: -6.248199741 + -0.2 = -6.448199741 x = -6.448199741 Simplifying x = -6.448199741

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.048199741, -6.448199741}

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