(6x^2-6x-74)+(7x^2+9x)=

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Solution for (6x^2-6x-74)+(7x^2+9x)= equation:


Simplifying
(6x2 + -6x + -74) + (7x2 + 9x) = 0

Reorder the terms:
(-74 + -6x + 6x2) + (7x2 + 9x) = 0

Remove parenthesis around (-74 + -6x + 6x2)
-74 + -6x + 6x2 + (7x2 + 9x) = 0

Reorder the terms:
-74 + -6x + 6x2 + (9x + 7x2) = 0

Remove parenthesis around (9x + 7x2)
-74 + -6x + 6x2 + 9x + 7x2 = 0

Reorder the terms:
-74 + -6x + 9x + 6x2 + 7x2 = 0

Combine like terms: -6x + 9x = 3x
-74 + 3x + 6x2 + 7x2 = 0

Combine like terms: 6x2 + 7x2 = 13x2
-74 + 3x + 13x2 = 0

Solving
-74 + 3x + 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'.
-5.692307692 + 0.2307692308x + x2 = 0

Move the constant term to the right:

Add '5.692307692' to each side of the equation.
-5.692307692 + 0.2307692308x + 5.692307692 + x2 = 0 + 5.692307692

Reorder the terms:
-5.692307692 + 5.692307692 + 0.2307692308x + x2 = 0 + 5.692307692

Combine like terms: -5.692307692 + 5.692307692 = 0.000000000
0.000000000 + 0.2307692308x + x2 = 0 + 5.692307692
0.2307692308x + x2 = 0 + 5.692307692

Combine like terms: 0 + 5.692307692 = 5.692307692
0.2307692308x + x2 = 5.692307692

The x term is 0.2307692308x.  Take half its coefficient (0.1153846154).
Square it (0.01331360947) and add it to both sides.

Add '0.01331360947' to each side of the equation.
0.2307692308x + 0.01331360947 + x2 = 5.692307692 + 0.01331360947

Reorder the terms:
0.01331360947 + 0.2307692308x + x2 = 5.692307692 + 0.01331360947

Combine like terms: 5.692307692 + 0.01331360947 = 5.70562130147
0.01331360947 + 0.2307692308x + x2 = 5.70562130147

Factor a perfect square on the left side:
(x + 0.1153846154)(x + 0.1153846154) = 5.70562130147

Calculate the square root of the right side: 2.388644239

Break this problem into two subproblems by setting 
(x + 0.1153846154) equal to 2.388644239 and -2.388644239.

Subproblem 1

x + 0.1153846154 = 2.388644239 Simplifying x + 0.1153846154 = 2.388644239 Reorder the terms: 0.1153846154 + x = 2.388644239 Solving 0.1153846154 + x = 2.388644239 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1153846154' to each side of the equation. 0.1153846154 + -0.1153846154 + x = 2.388644239 + -0.1153846154 Combine like terms: 0.1153846154 + -0.1153846154 = 0.0000000000 0.0000000000 + x = 2.388644239 + -0.1153846154 x = 2.388644239 + -0.1153846154 Combine like terms: 2.388644239 + -0.1153846154 = 2.2732596236 x = 2.2732596236 Simplifying x = 2.2732596236

Subproblem 2

x + 0.1153846154 = -2.388644239 Simplifying x + 0.1153846154 = -2.388644239 Reorder the terms: 0.1153846154 + x = -2.388644239 Solving 0.1153846154 + x = -2.388644239 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1153846154' to each side of the equation. 0.1153846154 + -0.1153846154 + x = -2.388644239 + -0.1153846154 Combine like terms: 0.1153846154 + -0.1153846154 = 0.0000000000 0.0000000000 + x = -2.388644239 + -0.1153846154 x = -2.388644239 + -0.1153846154 Combine like terms: -2.388644239 + -0.1153846154 = -2.5040288544 x = -2.5040288544 Simplifying x = -2.5040288544

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.2732596236, -2.5040288544}

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