(5x^2-8x-6)+(7x^2-9x-3)=

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Solution for (5x^2-8x-6)+(7x^2-9x-3)= equation:


Simplifying
(5x2 + -8x + -6) + (7x2 + -9x + -3) = 0

Reorder the terms:
(-6 + -8x + 5x2) + (7x2 + -9x + -3) = 0

Remove parenthesis around (-6 + -8x + 5x2)
-6 + -8x + 5x2 + (7x2 + -9x + -3) = 0

Reorder the terms:
-6 + -8x + 5x2 + (-3 + -9x + 7x2) = 0

Remove parenthesis around (-3 + -9x + 7x2)
-6 + -8x + 5x2 + -3 + -9x + 7x2 = 0

Reorder the terms:
-6 + -3 + -8x + -9x + 5x2 + 7x2 = 0

Combine like terms: -6 + -3 = -9
-9 + -8x + -9x + 5x2 + 7x2 = 0

Combine like terms: -8x + -9x = -17x
-9 + -17x + 5x2 + 7x2 = 0

Combine like terms: 5x2 + 7x2 = 12x2
-9 + -17x + 12x2 = 0

Solving
-9 + -17x + 12x2 = 0

Solving for variable 'x'.

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

Divide each side by '12'.
-0.75 + -1.416666667x + x2 = 0

Move the constant term to the right:

Add '0.75' to each side of the equation.
-0.75 + -1.416666667x + 0.75 + x2 = 0 + 0.75

Reorder the terms:
-0.75 + 0.75 + -1.416666667x + x2 = 0 + 0.75

Combine like terms: -0.75 + 0.75 = 0.00
0.00 + -1.416666667x + x2 = 0 + 0.75
-1.416666667x + x2 = 0 + 0.75

Combine like terms: 0 + 0.75 = 0.75
-1.416666667x + x2 = 0.75

The x term is -1.416666667x.  Take half its coefficient (-0.7083333335).
Square it (0.5017361113) and add it to both sides.

Add '0.5017361113' to each side of the equation.
-1.416666667x + 0.5017361113 + x2 = 0.75 + 0.5017361113

Reorder the terms:
0.5017361113 + -1.416666667x + x2 = 0.75 + 0.5017361113

Combine like terms: 0.75 + 0.5017361113 = 1.2517361113
0.5017361113 + -1.416666667x + x2 = 1.2517361113

Factor a perfect square on the left side:
(x + -0.7083333335)(x + -0.7083333335) = 1.2517361113

Calculate the square root of the right side: 1.118810132

Break this problem into two subproblems by setting 
(x + -0.7083333335) equal to 1.118810132 and -1.118810132.

Subproblem 1

x + -0.7083333335 = 1.118810132 Simplifying x + -0.7083333335 = 1.118810132 Reorder the terms: -0.7083333335 + x = 1.118810132 Solving -0.7083333335 + x = 1.118810132 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7083333335' to each side of the equation. -0.7083333335 + 0.7083333335 + x = 1.118810132 + 0.7083333335 Combine like terms: -0.7083333335 + 0.7083333335 = 0.0000000000 0.0000000000 + x = 1.118810132 + 0.7083333335 x = 1.118810132 + 0.7083333335 Combine like terms: 1.118810132 + 0.7083333335 = 1.8271434655 x = 1.8271434655 Simplifying x = 1.8271434655

Subproblem 2

x + -0.7083333335 = -1.118810132 Simplifying x + -0.7083333335 = -1.118810132 Reorder the terms: -0.7083333335 + x = -1.118810132 Solving -0.7083333335 + x = -1.118810132 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7083333335' to each side of the equation. -0.7083333335 + 0.7083333335 + x = -1.118810132 + 0.7083333335 Combine like terms: -0.7083333335 + 0.7083333335 = 0.0000000000 0.0000000000 + x = -1.118810132 + 0.7083333335 x = -1.118810132 + 0.7083333335 Combine like terms: -1.118810132 + 0.7083333335 = -0.4104767985 x = -0.4104767985 Simplifying x = -0.4104767985

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.8271434655, -0.4104767985}

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