9x^2+3-5x-7x^2-6x=

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Solution for 9x^2+3-5x-7x^2-6x= equation:


Simplifying
9x2 + 3 + -5x + -7x2 + -6x = 0

Reorder the terms:
3 + -5x + -6x + 9x2 + -7x2 = 0

Combine like terms: -5x + -6x = -11x
3 + -11x + 9x2 + -7x2 = 0

Combine like terms: 9x2 + -7x2 = 2x2
3 + -11x + 2x2 = 0

Solving
3 + -11x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
1.5 + -5.5x + x2 = 0

Move the constant term to the right:

Add '-1.5' to each side of the equation.
1.5 + -5.5x + -1.5 + x2 = 0 + -1.5

Reorder the terms:
1.5 + -1.5 + -5.5x + x2 = 0 + -1.5

Combine like terms: 1.5 + -1.5 = 0.0
0.0 + -5.5x + x2 = 0 + -1.5
-5.5x + x2 = 0 + -1.5

Combine like terms: 0 + -1.5 = -1.5
-5.5x + x2 = -1.5

The x term is -5.5x.  Take half its coefficient (-2.75).
Square it (7.5625) and add it to both sides.

Add '7.5625' to each side of the equation.
-5.5x + 7.5625 + x2 = -1.5 + 7.5625

Reorder the terms:
7.5625 + -5.5x + x2 = -1.5 + 7.5625

Combine like terms: -1.5 + 7.5625 = 6.0625
7.5625 + -5.5x + x2 = 6.0625

Factor a perfect square on the left side:
(x + -2.75)(x + -2.75) = 6.0625

Calculate the square root of the right side: 2.46221445

Break this problem into two subproblems by setting 
(x + -2.75) equal to 2.46221445 and -2.46221445.

Subproblem 1

x + -2.75 = 2.46221445 Simplifying x + -2.75 = 2.46221445 Reorder the terms: -2.75 + x = 2.46221445 Solving -2.75 + x = 2.46221445 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.75' to each side of the equation. -2.75 + 2.75 + x = 2.46221445 + 2.75 Combine like terms: -2.75 + 2.75 = 0.00 0.00 + x = 2.46221445 + 2.75 x = 2.46221445 + 2.75 Combine like terms: 2.46221445 + 2.75 = 5.21221445 x = 5.21221445 Simplifying x = 5.21221445

Subproblem 2

x + -2.75 = -2.46221445 Simplifying x + -2.75 = -2.46221445 Reorder the terms: -2.75 + x = -2.46221445 Solving -2.75 + x = -2.46221445 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.75' to each side of the equation. -2.75 + 2.75 + x = -2.46221445 + 2.75 Combine like terms: -2.75 + 2.75 = 0.00 0.00 + x = -2.46221445 + 2.75 x = -2.46221445 + 2.75 Combine like terms: -2.46221445 + 2.75 = 0.28778555 x = 0.28778555 Simplifying x = 0.28778555

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.21221445, 0.28778555}

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