(7x^2-2x+13)+(6x^2+9x-72)=

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Solution for (7x^2-2x+13)+(6x^2+9x-72)= equation:


Simplifying
(7x2 + -2x + 13) + (6x2 + 9x + -72) = 0

Reorder the terms:
(13 + -2x + 7x2) + (6x2 + 9x + -72) = 0

Remove parenthesis around (13 + -2x + 7x2)
13 + -2x + 7x2 + (6x2 + 9x + -72) = 0

Reorder the terms:
13 + -2x + 7x2 + (-72 + 9x + 6x2) = 0

Remove parenthesis around (-72 + 9x + 6x2)
13 + -2x + 7x2 + -72 + 9x + 6x2 = 0

Reorder the terms:
13 + -72 + -2x + 9x + 7x2 + 6x2 = 0

Combine like terms: 13 + -72 = -59
-59 + -2x + 9x + 7x2 + 6x2 = 0

Combine like terms: -2x + 9x = 7x
-59 + 7x + 7x2 + 6x2 = 0

Combine like terms: 7x2 + 6x2 = 13x2
-59 + 7x + 13x2 = 0

Solving
-59 + 7x + 13x2 = 0

Solving for variable 'x'.

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

Divide each side by '13'.
-4.538461538 + 0.5384615385x + x2 = 0

Move the constant term to the right:

Add '4.538461538' to each side of the equation.
-4.538461538 + 0.5384615385x + 4.538461538 + x2 = 0 + 4.538461538

Reorder the terms:
-4.538461538 + 4.538461538 + 0.5384615385x + x2 = 0 + 4.538461538

Combine like terms: -4.538461538 + 4.538461538 = 0.000000000
0.000000000 + 0.5384615385x + x2 = 0 + 4.538461538
0.5384615385x + x2 = 0 + 4.538461538

Combine like terms: 0 + 4.538461538 = 4.538461538
0.5384615385x + x2 = 4.538461538

The x term is 0.5384615385x.  Take half its coefficient (0.2692307693).
Square it (0.07248520714) and add it to both sides.

Add '0.07248520714' to each side of the equation.
0.5384615385x + 0.07248520714 + x2 = 4.538461538 + 0.07248520714

Reorder the terms:
0.07248520714 + 0.5384615385x + x2 = 4.538461538 + 0.07248520714

Combine like terms: 4.538461538 + 0.07248520714 = 4.61094674514
0.07248520714 + 0.5384615385x + x2 = 4.61094674514

Factor a perfect square on the left side:
(x + 0.2692307693)(x + 0.2692307693) = 4.61094674514

Calculate the square root of the right side: 2.147311516

Break this problem into two subproblems by setting 
(x + 0.2692307693) equal to 2.147311516 and -2.147311516.

Subproblem 1

x + 0.2692307693 = 2.147311516 Simplifying x + 0.2692307693 = 2.147311516 Reorder the terms: 0.2692307693 + x = 2.147311516 Solving 0.2692307693 + x = 2.147311516 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2692307693' to each side of the equation. 0.2692307693 + -0.2692307693 + x = 2.147311516 + -0.2692307693 Combine like terms: 0.2692307693 + -0.2692307693 = 0.0000000000 0.0000000000 + x = 2.147311516 + -0.2692307693 x = 2.147311516 + -0.2692307693 Combine like terms: 2.147311516 + -0.2692307693 = 1.8780807467 x = 1.8780807467 Simplifying x = 1.8780807467

Subproblem 2

x + 0.2692307693 = -2.147311516 Simplifying x + 0.2692307693 = -2.147311516 Reorder the terms: 0.2692307693 + x = -2.147311516 Solving 0.2692307693 + x = -2.147311516 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2692307693' to each side of the equation. 0.2692307693 + -0.2692307693 + x = -2.147311516 + -0.2692307693 Combine like terms: 0.2692307693 + -0.2692307693 = 0.0000000000 0.0000000000 + x = -2.147311516 + -0.2692307693 x = -2.147311516 + -0.2692307693 Combine like terms: -2.147311516 + -0.2692307693 = -2.4165422853 x = -2.4165422853 Simplifying x = -2.4165422853

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.8780807467, -2.4165422853}

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