4(3x^2-5x)+6=5(7x^2-8)

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Solution for 4(3x^2-5x)+6=5(7x^2-8) equation:


Simplifying
4(3x2 + -5x) + 6 = 5(7x2 + -8)

Reorder the terms:
4(-5x + 3x2) + 6 = 5(7x2 + -8)
(-5x * 4 + 3x2 * 4) + 6 = 5(7x2 + -8)
(-20x + 12x2) + 6 = 5(7x2 + -8)

Reorder the terms:
6 + -20x + 12x2 = 5(7x2 + -8)

Reorder the terms:
6 + -20x + 12x2 = 5(-8 + 7x2)
6 + -20x + 12x2 = (-8 * 5 + 7x2 * 5)
6 + -20x + 12x2 = (-40 + 35x2)

Solving
6 + -20x + 12x2 = -40 + 35x2

Solving for variable 'x'.

Reorder the terms:
6 + 40 + -20x + 12x2 + -35x2 = -40 + 35x2 + 40 + -35x2

Combine like terms: 6 + 40 = 46
46 + -20x + 12x2 + -35x2 = -40 + 35x2 + 40 + -35x2

Combine like terms: 12x2 + -35x2 = -23x2
46 + -20x + -23x2 = -40 + 35x2 + 40 + -35x2

Reorder the terms:
46 + -20x + -23x2 = -40 + 40 + 35x2 + -35x2

Combine like terms: -40 + 40 = 0
46 + -20x + -23x2 = 0 + 35x2 + -35x2
46 + -20x + -23x2 = 35x2 + -35x2

Combine like terms: 35x2 + -35x2 = 0
46 + -20x + -23x2 = 0

Begin completing the square.  Divide all terms by
-23 the coefficient of the squared term: 

Divide each side by '-23'.
-2 + 0.8695652174x + x2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + 0.8695652174x + 2 + x2 = 0 + 2

Reorder the terms:
-2 + 2 + 0.8695652174x + x2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + 0.8695652174x + x2 = 0 + 2
0.8695652174x + x2 = 0 + 2

Combine like terms: 0 + 2 = 2
0.8695652174x + x2 = 2

The x term is 0.8695652174x.  Take half its coefficient (0.4347826087).
Square it (0.1890359168) and add it to both sides.

Add '0.1890359168' to each side of the equation.
0.8695652174x + 0.1890359168 + x2 = 2 + 0.1890359168

Reorder the terms:
0.1890359168 + 0.8695652174x + x2 = 2 + 0.1890359168

Combine like terms: 2 + 0.1890359168 = 2.1890359168
0.1890359168 + 0.8695652174x + x2 = 2.1890359168

Factor a perfect square on the left side:
(x + 0.4347826087)(x + 0.4347826087) = 2.1890359168

Calculate the square root of the right side: 1.479539089

Break this problem into two subproblems by setting 
(x + 0.4347826087) equal to 1.479539089 and -1.479539089.

Subproblem 1

x + 0.4347826087 = 1.479539089 Simplifying x + 0.4347826087 = 1.479539089 Reorder the terms: 0.4347826087 + x = 1.479539089 Solving 0.4347826087 + x = 1.479539089 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4347826087' to each side of the equation. 0.4347826087 + -0.4347826087 + x = 1.479539089 + -0.4347826087 Combine like terms: 0.4347826087 + -0.4347826087 = 0.0000000000 0.0000000000 + x = 1.479539089 + -0.4347826087 x = 1.479539089 + -0.4347826087 Combine like terms: 1.479539089 + -0.4347826087 = 1.0447564803 x = 1.0447564803 Simplifying x = 1.0447564803

Subproblem 2

x + 0.4347826087 = -1.479539089 Simplifying x + 0.4347826087 = -1.479539089 Reorder the terms: 0.4347826087 + x = -1.479539089 Solving 0.4347826087 + x = -1.479539089 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4347826087' to each side of the equation. 0.4347826087 + -0.4347826087 + x = -1.479539089 + -0.4347826087 Combine like terms: 0.4347826087 + -0.4347826087 = 0.0000000000 0.0000000000 + x = -1.479539089 + -0.4347826087 x = -1.479539089 + -0.4347826087 Combine like terms: -1.479539089 + -0.4347826087 = -1.9143216977 x = -1.9143216977 Simplifying x = -1.9143216977

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.0447564803, -1.9143216977}

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