2x^2+x-7=6x^2+7x-12

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Solution for 2x^2+x-7=6x^2+7x-12 equation:


Simplifying
2x2 + x + -7 = 6x2 + 7x + -12

Reorder the terms:
-7 + x + 2x2 = 6x2 + 7x + -12

Reorder the terms:
-7 + x + 2x2 = -12 + 7x + 6x2

Solving
-7 + x + 2x2 = -12 + 7x + 6x2

Solving for variable 'x'.

Reorder the terms:
-7 + 12 + x + -7x + 2x2 + -6x2 = -12 + 7x + 6x2 + 12 + -7x + -6x2

Combine like terms: -7 + 12 = 5
5 + x + -7x + 2x2 + -6x2 = -12 + 7x + 6x2 + 12 + -7x + -6x2

Combine like terms: x + -7x = -6x
5 + -6x + 2x2 + -6x2 = -12 + 7x + 6x2 + 12 + -7x + -6x2

Combine like terms: 2x2 + -6x2 = -4x2
5 + -6x + -4x2 = -12 + 7x + 6x2 + 12 + -7x + -6x2

Reorder the terms:
5 + -6x + -4x2 = -12 + 12 + 7x + -7x + 6x2 + -6x2

Combine like terms: -12 + 12 = 0
5 + -6x + -4x2 = 0 + 7x + -7x + 6x2 + -6x2
5 + -6x + -4x2 = 7x + -7x + 6x2 + -6x2

Combine like terms: 7x + -7x = 0
5 + -6x + -4x2 = 0 + 6x2 + -6x2
5 + -6x + -4x2 = 6x2 + -6x2

Combine like terms: 6x2 + -6x2 = 0
5 + -6x + -4x2 = 0

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
-1.25 + 1.5x + x2 = 0

Move the constant term to the right:

Add '1.25' to each side of the equation.
-1.25 + 1.5x + 1.25 + x2 = 0 + 1.25

Reorder the terms:
-1.25 + 1.25 + 1.5x + x2 = 0 + 1.25

Combine like terms: -1.25 + 1.25 = 0.00
0.00 + 1.5x + x2 = 0 + 1.25
1.5x + x2 = 0 + 1.25

Combine like terms: 0 + 1.25 = 1.25
1.5x + x2 = 1.25

The x term is 1.5x.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5x + 0.5625 + x2 = 1.25 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = 1.25 + 0.5625

Combine like terms: 1.25 + 0.5625 = 1.8125
0.5625 + 1.5x + x2 = 1.8125

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 1.8125

Calculate the square root of the right side: 1.346291202

Break this problem into two subproblems by setting 
(x + 0.75) equal to 1.346291202 and -1.346291202.

Subproblem 1

x + 0.75 = 1.346291202 Simplifying x + 0.75 = 1.346291202 Reorder the terms: 0.75 + x = 1.346291202 Solving 0.75 + x = 1.346291202 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = 1.346291202 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 1.346291202 + -0.75 x = 1.346291202 + -0.75 Combine like terms: 1.346291202 + -0.75 = 0.596291202 x = 0.596291202 Simplifying x = 0.596291202

Subproblem 2

x + 0.75 = -1.346291202 Simplifying x + 0.75 = -1.346291202 Reorder the terms: 0.75 + x = -1.346291202 Solving 0.75 + x = -1.346291202 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = -1.346291202 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -1.346291202 + -0.75 x = -1.346291202 + -0.75 Combine like terms: -1.346291202 + -0.75 = -2.096291202 x = -2.096291202 Simplifying x = -2.096291202

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.596291202, -2.096291202}

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