.36x+x^2=.82

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Solution for .36x+x^2=.82 equation:


Simplifying
0.36x + x2 = 0.82

Solving
0.36x + x2 = 0.82

Solving for variable 'x'.

Reorder the terms:
-0.82 + 0.36x + x2 = 0.82 + -0.82

Combine like terms: 0.82 + -0.82 = 0.00
-0.82 + 0.36x + x2 = 0.00

Begin completing the square.

Move the constant term to the right:

Add '0.82' to each side of the equation.
-0.82 + 0.36x + 0.82 + x2 = 0.00 + 0.82

Reorder the terms:
-0.82 + 0.82 + 0.36x + x2 = 0.00 + 0.82

Combine like terms: -0.82 + 0.82 = 0.00
0.00 + 0.36x + x2 = 0.00 + 0.82
0.36x + x2 = 0.00 + 0.82

Combine like terms: 0.00 + 0.82 = 0.82
0.36x + x2 = 0.82

The x term is 0.36x.  Take half its coefficient (0.18).
Square it (0.0324) and add it to both sides.

Add '0.0324' to each side of the equation.
0.36x + 0.0324 + x2 = 0.82 + 0.0324

Reorder the terms:
0.0324 + 0.36x + x2 = 0.82 + 0.0324

Combine like terms: 0.82 + 0.0324 = 0.8524
0.0324 + 0.36x + x2 = 0.8524

Factor a perfect square on the left side:
(x + 0.18)(x + 0.18) = 0.8524

Calculate the square root of the right side: 0.923255111

Break this problem into two subproblems by setting 
(x + 0.18) equal to 0.923255111 and -0.923255111.

Subproblem 1

x + 0.18 = 0.923255111 Simplifying x + 0.18 = 0.923255111 Reorder the terms: 0.18 + x = 0.923255111 Solving 0.18 + x = 0.923255111 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.18' to each side of the equation. 0.18 + -0.18 + x = 0.923255111 + -0.18 Combine like terms: 0.18 + -0.18 = 0.00 0.00 + x = 0.923255111 + -0.18 x = 0.923255111 + -0.18 Combine like terms: 0.923255111 + -0.18 = 0.743255111 x = 0.743255111 Simplifying x = 0.743255111

Subproblem 2

x + 0.18 = -0.923255111 Simplifying x + 0.18 = -0.923255111 Reorder the terms: 0.18 + x = -0.923255111 Solving 0.18 + x = -0.923255111 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.18' to each side of the equation. 0.18 + -0.18 + x = -0.923255111 + -0.18 Combine like terms: 0.18 + -0.18 = 0.00 0.00 + x = -0.923255111 + -0.18 x = -0.923255111 + -0.18 Combine like terms: -0.923255111 + -0.18 = -1.103255111 x = -1.103255111 Simplifying x = -1.103255111

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.743255111, -1.103255111}

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