(x^2+4x-6)+(2x^2+x-8)=

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


Simplifying
(x2 + 4x + -6) + (2x2 + x + -8) = 0

Reorder the terms:
(-6 + 4x + x2) + (2x2 + x + -8) = 0

Remove parenthesis around (-6 + 4x + x2)
-6 + 4x + x2 + (2x2 + x + -8) = 0

Reorder the terms:
-6 + 4x + x2 + (-8 + x + 2x2) = 0

Remove parenthesis around (-8 + x + 2x2)
-6 + 4x + x2 + -8 + x + 2x2 = 0

Reorder the terms:
-6 + -8 + 4x + x + x2 + 2x2 = 0

Combine like terms: -6 + -8 = -14
-14 + 4x + x + x2 + 2x2 = 0

Combine like terms: 4x + x = 5x
-14 + 5x + x2 + 2x2 = 0

Combine like terms: x2 + 2x2 = 3x2
-14 + 5x + 3x2 = 0

Solving
-14 + 5x + 3x2 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
-4.666666667 + 1.666666667x + x2 = 0

Move the constant term to the right:

Add '4.666666667' to each side of the equation.
-4.666666667 + 1.666666667x + 4.666666667 + x2 = 0 + 4.666666667

Reorder the terms:
-4.666666667 + 4.666666667 + 1.666666667x + x2 = 0 + 4.666666667

Combine like terms: -4.666666667 + 4.666666667 = 0.000000000
0.000000000 + 1.666666667x + x2 = 0 + 4.666666667
1.666666667x + x2 = 0 + 4.666666667

Combine like terms: 0 + 4.666666667 = 4.666666667
1.666666667x + x2 = 4.666666667

The x term is 1.666666667x.  Take half its coefficient (0.8333333335).
Square it (0.6944444447) and add it to both sides.

Add '0.6944444447' to each side of the equation.
1.666666667x + 0.6944444447 + x2 = 4.666666667 + 0.6944444447

Reorder the terms:
0.6944444447 + 1.666666667x + x2 = 4.666666667 + 0.6944444447

Combine like terms: 4.666666667 + 0.6944444447 = 5.3611111117
0.6944444447 + 1.666666667x + x2 = 5.3611111117

Factor a perfect square on the left side:
(x + 0.8333333335)(x + 0.8333333335) = 5.3611111117

Calculate the square root of the right side: 2.315407332

Break this problem into two subproblems by setting 
(x + 0.8333333335) equal to 2.315407332 and -2.315407332.

Subproblem 1

x + 0.8333333335 = 2.315407332 Simplifying x + 0.8333333335 = 2.315407332 Reorder the terms: 0.8333333335 + x = 2.315407332 Solving 0.8333333335 + x = 2.315407332 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8333333335' to each side of the equation. 0.8333333335 + -0.8333333335 + x = 2.315407332 + -0.8333333335 Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000 0.0000000000 + x = 2.315407332 + -0.8333333335 x = 2.315407332 + -0.8333333335 Combine like terms: 2.315407332 + -0.8333333335 = 1.4820739985 x = 1.4820739985 Simplifying x = 1.4820739985

Subproblem 2

x + 0.8333333335 = -2.315407332 Simplifying x + 0.8333333335 = -2.315407332 Reorder the terms: 0.8333333335 + x = -2.315407332 Solving 0.8333333335 + x = -2.315407332 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8333333335' to each side of the equation. 0.8333333335 + -0.8333333335 + x = -2.315407332 + -0.8333333335 Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000 0.0000000000 + x = -2.315407332 + -0.8333333335 x = -2.315407332 + -0.8333333335 Combine like terms: -2.315407332 + -0.8333333335 = -3.1487406655 x = -3.1487406655 Simplifying x = -3.1487406655

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.4820739985, -3.1487406655}

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