5x^2-19x-18=0

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Solution for 5x^2-19x-18=0 equation:


Simplifying
5x2 + -19x + -18 = 0

Reorder the terms:
-18 + -19x + 5x2 = 0

Solving
-18 + -19x + 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'.
-3.6 + -3.8x + x2 = 0

Move the constant term to the right:

Add '3.6' to each side of the equation.
-3.6 + -3.8x + 3.6 + x2 = 0 + 3.6

Reorder the terms:
-3.6 + 3.6 + -3.8x + x2 = 0 + 3.6

Combine like terms: -3.6 + 3.6 = 0.0
0.0 + -3.8x + x2 = 0 + 3.6
-3.8x + x2 = 0 + 3.6

Combine like terms: 0 + 3.6 = 3.6
-3.8x + x2 = 3.6

The x term is -3.8x.  Take half its coefficient (-1.9).
Square it (3.61) and add it to both sides.

Add '3.61' to each side of the equation.
-3.8x + 3.61 + x2 = 3.6 + 3.61

Reorder the terms:
3.61 + -3.8x + x2 = 3.6 + 3.61

Combine like terms: 3.6 + 3.61 = 7.21
3.61 + -3.8x + x2 = 7.21

Factor a perfect square on the left side:
(x + -1.9)(x + -1.9) = 7.21

Calculate the square root of the right side: 2.685144316

Break this problem into two subproblems by setting 
(x + -1.9) equal to 2.685144316 and -2.685144316.

Subproblem 1

x + -1.9 = 2.685144316 Simplifying x + -1.9 = 2.685144316 Reorder the terms: -1.9 + x = 2.685144316 Solving -1.9 + x = 2.685144316 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.9' to each side of the equation. -1.9 + 1.9 + x = 2.685144316 + 1.9 Combine like terms: -1.9 + 1.9 = 0.0 0.0 + x = 2.685144316 + 1.9 x = 2.685144316 + 1.9 Combine like terms: 2.685144316 + 1.9 = 4.585144316 x = 4.585144316 Simplifying x = 4.585144316

Subproblem 2

x + -1.9 = -2.685144316 Simplifying x + -1.9 = -2.685144316 Reorder the terms: -1.9 + x = -2.685144316 Solving -1.9 + x = -2.685144316 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.9' to each side of the equation. -1.9 + 1.9 + x = -2.685144316 + 1.9 Combine like terms: -1.9 + 1.9 = 0.0 0.0 + x = -2.685144316 + 1.9 x = -2.685144316 + 1.9 Combine like terms: -2.685144316 + 1.9 = -0.785144316 x = -0.785144316 Simplifying x = -0.785144316

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.585144316, -0.785144316}

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