2x^2+6x-40=-1x+5

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Solution for 2x^2+6x-40=-1x+5 equation:


Simplifying
2x2 + 6x + -40 = -1x + 5

Reorder the terms:
-40 + 6x + 2x2 = -1x + 5

Reorder the terms:
-40 + 6x + 2x2 = 5 + -1x

Solving
-40 + 6x + 2x2 = 5 + -1x

Solving for variable 'x'.

Reorder the terms:
-40 + -5 + 6x + x + 2x2 = 5 + -1x + -5 + x

Combine like terms: -40 + -5 = -45
-45 + 6x + x + 2x2 = 5 + -1x + -5 + x

Combine like terms: 6x + x = 7x
-45 + 7x + 2x2 = 5 + -1x + -5 + x

Reorder the terms:
-45 + 7x + 2x2 = 5 + -5 + -1x + x

Combine like terms: 5 + -5 = 0
-45 + 7x + 2x2 = 0 + -1x + x
-45 + 7x + 2x2 = -1x + x

Combine like terms: -1x + x = 0
-45 + 7x + 2x2 = 0

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

Divide each side by '2'.
-22.5 + 3.5x + x2 = 0

Move the constant term to the right:

Add '22.5' to each side of the equation.
-22.5 + 3.5x + 22.5 + x2 = 0 + 22.5

Reorder the terms:
-22.5 + 22.5 + 3.5x + x2 = 0 + 22.5

Combine like terms: -22.5 + 22.5 = 0.0
0.0 + 3.5x + x2 = 0 + 22.5
3.5x + x2 = 0 + 22.5

Combine like terms: 0 + 22.5 = 22.5
3.5x + x2 = 22.5

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 = 22.5 + 3.0625

Reorder the terms:
3.0625 + 3.5x + x2 = 22.5 + 3.0625

Combine like terms: 22.5 + 3.0625 = 25.5625
3.0625 + 3.5x + x2 = 25.5625

Factor a perfect square on the left side:
(x + 1.75)(x + 1.75) = 25.5625

Calculate the square root of the right side: 5.055937104

Break this problem into two subproblems by setting 
(x + 1.75) equal to 5.055937104 and -5.055937104.

Subproblem 1

x + 1.75 = 5.055937104 Simplifying x + 1.75 = 5.055937104 Reorder the terms: 1.75 + x = 5.055937104 Solving 1.75 + x = 5.055937104 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 = 5.055937104 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = 5.055937104 + -1.75 x = 5.055937104 + -1.75 Combine like terms: 5.055937104 + -1.75 = 3.305937104 x = 3.305937104 Simplifying x = 3.305937104

Subproblem 2

x + 1.75 = -5.055937104 Simplifying x + 1.75 = -5.055937104 Reorder the terms: 1.75 + x = -5.055937104 Solving 1.75 + x = -5.055937104 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 = -5.055937104 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = -5.055937104 + -1.75 x = -5.055937104 + -1.75 Combine like terms: -5.055937104 + -1.75 = -6.805937104 x = -6.805937104 Simplifying x = -6.805937104

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.305937104, -6.805937104}

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