2x^2+4x-45=0

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Solution for 2x^2+4x-45=0 equation:


Simplifying
2x2 + 4x + -45 = 0

Reorder the terms:
-45 + 4x + 2x2 = 0

Solving
-45 + 4x + 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'.
-22.5 + 2x + x2 = 0

Move the constant term to the right:

Add '22.5' to each side of the equation.
-22.5 + 2x + 22.5 + x2 = 0 + 22.5

Reorder the terms:
-22.5 + 22.5 + 2x + x2 = 0 + 22.5

Combine like terms: -22.5 + 22.5 = 0.0
0.0 + 2x + x2 = 0 + 22.5
2x + x2 = 0 + 22.5

Combine like terms: 0 + 22.5 = 22.5
2x + x2 = 22.5

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 22.5 + 1

Reorder the terms:
1 + 2x + x2 = 22.5 + 1

Combine like terms: 22.5 + 1 = 23.5
1 + 2x + x2 = 23.5

Factor a perfect square on the left side:
(x + 1)(x + 1) = 23.5

Calculate the square root of the right side: 4.847679857

Break this problem into two subproblems by setting 
(x + 1) equal to 4.847679857 and -4.847679857.

Subproblem 1

x + 1 = 4.847679857 Simplifying x + 1 = 4.847679857 Reorder the terms: 1 + x = 4.847679857 Solving 1 + x = 4.847679857 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 4.847679857 + -1 Combine like terms: 1 + -1 = 0 0 + x = 4.847679857 + -1 x = 4.847679857 + -1 Combine like terms: 4.847679857 + -1 = 3.847679857 x = 3.847679857 Simplifying x = 3.847679857

Subproblem 2

x + 1 = -4.847679857 Simplifying x + 1 = -4.847679857 Reorder the terms: 1 + x = -4.847679857 Solving 1 + x = -4.847679857 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -4.847679857 + -1 Combine like terms: 1 + -1 = 0 0 + x = -4.847679857 + -1 x = -4.847679857 + -1 Combine like terms: -4.847679857 + -1 = -5.847679857 x = -5.847679857 Simplifying x = -5.847679857

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.847679857, -5.847679857}

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