12x^2+4-5x-7x^2-11x=

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Solution for 12x^2+4-5x-7x^2-11x= equation:


Simplifying
12x2 + 4 + -5x + -7x2 + -11x = 0

Reorder the terms:
4 + -5x + -11x + 12x2 + -7x2 = 0

Combine like terms: -5x + -11x = -16x
4 + -16x + 12x2 + -7x2 = 0

Combine like terms: 12x2 + -7x2 = 5x2
4 + -16x + 5x2 = 0

Solving
4 + -16x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
0.8 + -3.2x + x2 = 0

Move the constant term to the right:

Add '-0.8' to each side of the equation.
0.8 + -3.2x + -0.8 + x2 = 0 + -0.8

Reorder the terms:
0.8 + -0.8 + -3.2x + x2 = 0 + -0.8

Combine like terms: 0.8 + -0.8 = 0.0
0.0 + -3.2x + x2 = 0 + -0.8
-3.2x + x2 = 0 + -0.8

Combine like terms: 0 + -0.8 = -0.8
-3.2x + x2 = -0.8

The x term is -3.2x.  Take half its coefficient (-1.6).
Square it (2.56) and add it to both sides.

Add '2.56' to each side of the equation.
-3.2x + 2.56 + x2 = -0.8 + 2.56

Reorder the terms:
2.56 + -3.2x + x2 = -0.8 + 2.56

Combine like terms: -0.8 + 2.56 = 1.76
2.56 + -3.2x + x2 = 1.76

Factor a perfect square on the left side:
(x + -1.6)(x + -1.6) = 1.76

Calculate the square root of the right side: 1.326649916

Break this problem into two subproblems by setting 
(x + -1.6) equal to 1.326649916 and -1.326649916.

Subproblem 1

x + -1.6 = 1.326649916 Simplifying x + -1.6 = 1.326649916 Reorder the terms: -1.6 + x = 1.326649916 Solving -1.6 + x = 1.326649916 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.6' to each side of the equation. -1.6 + 1.6 + x = 1.326649916 + 1.6 Combine like terms: -1.6 + 1.6 = 0.0 0.0 + x = 1.326649916 + 1.6 x = 1.326649916 + 1.6 Combine like terms: 1.326649916 + 1.6 = 2.926649916 x = 2.926649916 Simplifying x = 2.926649916

Subproblem 2

x + -1.6 = -1.326649916 Simplifying x + -1.6 = -1.326649916 Reorder the terms: -1.6 + x = -1.326649916 Solving -1.6 + x = -1.326649916 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.6' to each side of the equation. -1.6 + 1.6 + x = -1.326649916 + 1.6 Combine like terms: -1.6 + 1.6 = 0.0 0.0 + x = -1.326649916 + 1.6 x = -1.326649916 + 1.6 Combine like terms: -1.326649916 + 1.6 = 0.273350084 x = 0.273350084 Simplifying x = 0.273350084

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.926649916, 0.273350084}

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