5x^2-18x-210=0

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Solution for 5x^2-18x-210=0 equation:


Simplifying
5x2 + -18x + -210 = 0

Reorder the terms:
-210 + -18x + 5x2 = 0

Solving
-210 + -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'.
-42 + -3.6x + x2 = 0

Move the constant term to the right:

Add '42' to each side of the equation.
-42 + -3.6x + 42 + x2 = 0 + 42

Reorder the terms:
-42 + 42 + -3.6x + x2 = 0 + 42

Combine like terms: -42 + 42 = 0
0 + -3.6x + x2 = 0 + 42
-3.6x + x2 = 0 + 42

Combine like terms: 0 + 42 = 42
-3.6x + x2 = 42

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 = 42 + 3.24

Reorder the terms:
3.24 + -3.6x + x2 = 42 + 3.24

Combine like terms: 42 + 3.24 = 45.24
3.24 + -3.6x + x2 = 45.24

Factor a perfect square on the left side:
(x + -1.8)(x + -1.8) = 45.24

Calculate the square root of the right side: 6.726068688

Break this problem into two subproblems by setting 
(x + -1.8) equal to 6.726068688 and -6.726068688.

Subproblem 1

x + -1.8 = 6.726068688 Simplifying x + -1.8 = 6.726068688 Reorder the terms: -1.8 + x = 6.726068688 Solving -1.8 + x = 6.726068688 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 = 6.726068688 + 1.8 Combine like terms: -1.8 + 1.8 = 0.0 0.0 + x = 6.726068688 + 1.8 x = 6.726068688 + 1.8 Combine like terms: 6.726068688 + 1.8 = 8.526068688 x = 8.526068688 Simplifying x = 8.526068688

Subproblem 2

x + -1.8 = -6.726068688 Simplifying x + -1.8 = -6.726068688 Reorder the terms: -1.8 + x = -6.726068688 Solving -1.8 + x = -6.726068688 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 = -6.726068688 + 1.8 Combine like terms: -1.8 + 1.8 = 0.0 0.0 + x = -6.726068688 + 1.8 x = -6.726068688 + 1.8 Combine like terms: -6.726068688 + 1.8 = -4.926068688 x = -4.926068688 Simplifying x = -4.926068688

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.526068688, -4.926068688}

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