13.2x+x^2-1296=0

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Solution for 13.2x+x^2-1296=0 equation:


Simplifying
13.2x + x2 + -1296 = 0

Reorder the terms:
-1296 + 13.2x + x2 = 0

Solving
-1296 + 13.2x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '1296' to each side of the equation.
-1296 + 13.2x + 1296 + x2 = 0 + 1296

Reorder the terms:
-1296 + 1296 + 13.2x + x2 = 0 + 1296

Combine like terms: -1296 + 1296 = 0
0 + 13.2x + x2 = 0 + 1296
13.2x + x2 = 0 + 1296

Combine like terms: 0 + 1296 = 1296
13.2x + x2 = 1296

The x term is 13.2x.  Take half its coefficient (6.6).
Square it (43.56) and add it to both sides.

Add '43.56' to each side of the equation.
13.2x + 43.56 + x2 = 1296 + 43.56

Reorder the terms:
43.56 + 13.2x + x2 = 1296 + 43.56

Combine like terms: 1296 + 43.56 = 1339.56
43.56 + 13.2x + x2 = 1339.56

Factor a perfect square on the left side:
(x + 6.6)(x + 6.6) = 1339.56

Calculate the square root of the right side: 36.6

Break this problem into two subproblems by setting 
(x + 6.6) equal to 36.6 and -36.6.

Subproblem 1

x + 6.6 = 36.6 Simplifying x + 6.6 = 36.6 Reorder the terms: 6.6 + x = 36.6 Solving 6.6 + x = 36.6 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6.6' to each side of the equation. 6.6 + -6.6 + x = 36.6 + -6.6 Combine like terms: 6.6 + -6.6 = 0.0 0.0 + x = 36.6 + -6.6 x = 36.6 + -6.6 Combine like terms: 36.6 + -6.6 = 30 x = 30 Simplifying x = 30

Subproblem 2

x + 6.6 = -36.6 Simplifying x + 6.6 = -36.6 Reorder the terms: 6.6 + x = -36.6 Solving 6.6 + x = -36.6 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6.6' to each side of the equation. 6.6 + -6.6 + x = -36.6 + -6.6 Combine like terms: 6.6 + -6.6 = 0.0 0.0 + x = -36.6 + -6.6 x = -36.6 + -6.6 Combine like terms: -36.6 + -6.6 = -43.2 x = -43.2 Simplifying x = -43.2

Solution

The solution to the problem is based on the solutions from the subproblems. x = {30, -43.2}

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