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

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


Simplifying
(2x2 + 3x + -6) + -1(-4x + 5) = 0

Reorder the terms:
(-6 + 3x + 2x2) + -1(-4x + 5) = 0

Remove parenthesis around (-6 + 3x + 2x2)
-6 + 3x + 2x2 + -1(-4x + 5) = 0

Reorder the terms:
-6 + 3x + 2x2 + -1(5 + -4x) = 0
-6 + 3x + 2x2 + (5 * -1 + -4x * -1) = 0
-6 + 3x + 2x2 + (-5 + 4x) = 0

Reorder the terms:
-6 + -5 + 3x + 4x + 2x2 = 0

Combine like terms: -6 + -5 = -11
-11 + 3x + 4x + 2x2 = 0

Combine like terms: 3x + 4x = 7x
-11 + 7x + 2x2 = 0

Solving
-11 + 7x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-5.5 + 3.5x + x2 = 0

Move the constant term to the right:

Add '5.5' to each side of the equation.
-5.5 + 3.5x + 5.5 + x2 = 0 + 5.5

Reorder the terms:
-5.5 + 5.5 + 3.5x + x2 = 0 + 5.5

Combine like terms: -5.5 + 5.5 = 0.0
0.0 + 3.5x + x2 = 0 + 5.5
3.5x + x2 = 0 + 5.5

Combine like terms: 0 + 5.5 = 5.5
3.5x + x2 = 5.5

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 = 5.5 + 3.0625

Reorder the terms:
3.0625 + 3.5x + x2 = 5.5 + 3.0625

Combine like terms: 5.5 + 3.0625 = 8.5625
3.0625 + 3.5x + x2 = 8.5625

Factor a perfect square on the left side:
(x + 1.75)(x + 1.75) = 8.5625

Calculate the square root of the right side: 2.926174978

Break this problem into two subproblems by setting 
(x + 1.75) equal to 2.926174978 and -2.926174978.

Subproblem 1

x + 1.75 = 2.926174978 Simplifying x + 1.75 = 2.926174978 Reorder the terms: 1.75 + x = 2.926174978 Solving 1.75 + x = 2.926174978 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 = 2.926174978 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = 2.926174978 + -1.75 x = 2.926174978 + -1.75 Combine like terms: 2.926174978 + -1.75 = 1.176174978 x = 1.176174978 Simplifying x = 1.176174978

Subproblem 2

x + 1.75 = -2.926174978 Simplifying x + 1.75 = -2.926174978 Reorder the terms: 1.75 + x = -2.926174978 Solving 1.75 + x = -2.926174978 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 = -2.926174978 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = -2.926174978 + -1.75 x = -2.926174978 + -1.75 Combine like terms: -2.926174978 + -1.75 = -4.676174978 x = -4.676174978 Simplifying x = -4.676174978

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.176174978, -4.676174978}

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