x^2+2x-6=3x^2-5x-7

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Solution for x^2+2x-6=3x^2-5x-7 equation:


Simplifying
x2 + 2x + -6 = 3x2 + -5x + -7

Reorder the terms:
-6 + 2x + x2 = 3x2 + -5x + -7

Reorder the terms:
-6 + 2x + x2 = -7 + -5x + 3x2

Solving
-6 + 2x + x2 = -7 + -5x + 3x2

Solving for variable 'x'.

Reorder the terms:
-6 + 7 + 2x + 5x + x2 + -3x2 = -7 + -5x + 3x2 + 7 + 5x + -3x2

Combine like terms: -6 + 7 = 1
1 + 2x + 5x + x2 + -3x2 = -7 + -5x + 3x2 + 7 + 5x + -3x2

Combine like terms: 2x + 5x = 7x
1 + 7x + x2 + -3x2 = -7 + -5x + 3x2 + 7 + 5x + -3x2

Combine like terms: x2 + -3x2 = -2x2
1 + 7x + -2x2 = -7 + -5x + 3x2 + 7 + 5x + -3x2

Reorder the terms:
1 + 7x + -2x2 = -7 + 7 + -5x + 5x + 3x2 + -3x2

Combine like terms: -7 + 7 = 0
1 + 7x + -2x2 = 0 + -5x + 5x + 3x2 + -3x2
1 + 7x + -2x2 = -5x + 5x + 3x2 + -3x2

Combine like terms: -5x + 5x = 0
1 + 7x + -2x2 = 0 + 3x2 + -3x2
1 + 7x + -2x2 = 3x2 + -3x2

Combine like terms: 3x2 + -3x2 = 0
1 + 7x + -2x2 = 0

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
-0.5 + -3.5x + x2 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + -3.5x + 0.5 + x2 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + -3.5x + x2 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + -3.5x + x2 = 0 + 0.5
-3.5x + x2 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
-3.5x + x2 = 0.5

The x term is -3.5x.  Take half its coefficient (-1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
-3.5x + 3.0625 + x2 = 0.5 + 3.0625

Reorder the terms:
3.0625 + -3.5x + x2 = 0.5 + 3.0625

Combine like terms: 0.5 + 3.0625 = 3.5625
3.0625 + -3.5x + x2 = 3.5625

Factor a perfect square on the left side:
(x + -1.75)(x + -1.75) = 3.5625

Calculate the square root of the right side: 1.887458609

Break this problem into two subproblems by setting 
(x + -1.75) equal to 1.887458609 and -1.887458609.

Subproblem 1

x + -1.75 = 1.887458609 Simplifying x + -1.75 = 1.887458609 Reorder the terms: -1.75 + x = 1.887458609 Solving -1.75 + x = 1.887458609 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = 1.887458609 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = 1.887458609 + 1.75 x = 1.887458609 + 1.75 Combine like terms: 1.887458609 + 1.75 = 3.637458609 x = 3.637458609 Simplifying x = 3.637458609

Subproblem 2

x + -1.75 = -1.887458609 Simplifying x + -1.75 = -1.887458609 Reorder the terms: -1.75 + x = -1.887458609 Solving -1.75 + x = -1.887458609 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = -1.887458609 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = -1.887458609 + 1.75 x = -1.887458609 + 1.75 Combine like terms: -1.887458609 + 1.75 = -0.137458609 x = -0.137458609 Simplifying x = -0.137458609

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.637458609, -0.137458609}

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