5x^2+18x-50=0

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Solution for 5x^2+18x-50=0 equation:


Simplifying
5x2 + 18x + -50 = 0

Reorder the terms:
-50 + 18x + 5x2 = 0

Solving
-50 + 18x + 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'.
-10 + 3.6x + x2 = 0

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + 3.6x + 10 + x2 = 0 + 10

Reorder the terms:
-10 + 10 + 3.6x + x2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + 3.6x + x2 = 0 + 10
3.6x + x2 = 0 + 10

Combine like terms: 0 + 10 = 10
3.6x + x2 = 10

The x term is 3.6x.  Take half its coefficient (1.8).
Square it (3.24) and add it to both sides.

Add '3.24' to each side of the equation.
3.6x + 3.24 + x2 = 10 + 3.24

Reorder the terms:
3.24 + 3.6x + x2 = 10 + 3.24

Combine like terms: 10 + 3.24 = 13.24
3.24 + 3.6x + x2 = 13.24

Factor a perfect square on the left side:
(x + 1.8)(x + 1.8) = 13.24

Calculate the square root of the right side: 3.63868108

Break this problem into two subproblems by setting 
(x + 1.8) equal to 3.63868108 and -3.63868108.

Subproblem 1

x + 1.8 = 3.63868108 Simplifying x + 1.8 = 3.63868108 Reorder the terms: 1.8 + x = 3.63868108 Solving 1.8 + x = 3.63868108 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.8' to each side of the equation. 1.8 + -1.8 + x = 3.63868108 + -1.8 Combine like terms: 1.8 + -1.8 = 0.0 0.0 + x = 3.63868108 + -1.8 x = 3.63868108 + -1.8 Combine like terms: 3.63868108 + -1.8 = 1.83868108 x = 1.83868108 Simplifying x = 1.83868108

Subproblem 2

x + 1.8 = -3.63868108 Simplifying x + 1.8 = -3.63868108 Reorder the terms: 1.8 + x = -3.63868108 Solving 1.8 + x = -3.63868108 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.8' to each side of the equation. 1.8 + -1.8 + x = -3.63868108 + -1.8 Combine like terms: 1.8 + -1.8 = 0.0 0.0 + x = -3.63868108 + -1.8 x = -3.63868108 + -1.8 Combine like terms: -3.63868108 + -1.8 = -5.43868108 x = -5.43868108 Simplifying x = -5.43868108

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.83868108, -5.43868108}

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