5x^2+2x-45=0

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Solution for 5x^2+2x-45=0 equation:


Simplifying
5x2 + 2x + -45 = 0

Reorder the terms:
-45 + 2x + 5x2 = 0

Solving
-45 + 2x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-9 + 0.4x + x2 = 0

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + 0.4x + 9 + x2 = 0 + 9

Reorder the terms:
-9 + 9 + 0.4x + x2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + 0.4x + x2 = 0 + 9
0.4x + x2 = 0 + 9

Combine like terms: 0 + 9 = 9
0.4x + x2 = 9

The x term is 0.4x.  Take half its coefficient (0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
0.4x + 0.04 + x2 = 9 + 0.04

Reorder the terms:
0.04 + 0.4x + x2 = 9 + 0.04

Combine like terms: 9 + 0.04 = 9.04
0.04 + 0.4x + x2 = 9.04

Factor a perfect square on the left side:
(x + 0.2)(x + 0.2) = 9.04

Calculate the square root of the right side: 3.006659276

Break this problem into two subproblems by setting 
(x + 0.2) equal to 3.006659276 and -3.006659276.

Subproblem 1

x + 0.2 = 3.006659276 Simplifying x + 0.2 = 3.006659276 Reorder the terms: 0.2 + x = 3.006659276 Solving 0.2 + x = 3.006659276 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2' to each side of the equation. 0.2 + -0.2 + x = 3.006659276 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + x = 3.006659276 + -0.2 x = 3.006659276 + -0.2 Combine like terms: 3.006659276 + -0.2 = 2.806659276 x = 2.806659276 Simplifying x = 2.806659276

Subproblem 2

x + 0.2 = -3.006659276 Simplifying x + 0.2 = -3.006659276 Reorder the terms: 0.2 + x = -3.006659276 Solving 0.2 + x = -3.006659276 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2' to each side of the equation. 0.2 + -0.2 + x = -3.006659276 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + x = -3.006659276 + -0.2 x = -3.006659276 + -0.2 Combine like terms: -3.006659276 + -0.2 = -3.206659276 x = -3.206659276 Simplifying x = -3.206659276

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.806659276, -3.206659276}

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