5x^2-15x-216=0

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Solution for 5x^2-15x-216=0 equation:


Simplifying
5x2 + -15x + -216 = 0

Reorder the terms:
-216 + -15x + 5x2 = 0

Solving
-216 + -15x + 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'.
-43.2 + -3x + x2 = 0

Move the constant term to the right:

Add '43.2' to each side of the equation.
-43.2 + -3x + 43.2 + x2 = 0 + 43.2

Reorder the terms:
-43.2 + 43.2 + -3x + x2 = 0 + 43.2

Combine like terms: -43.2 + 43.2 = 0.0
0.0 + -3x + x2 = 0 + 43.2
-3x + x2 = 0 + 43.2

Combine like terms: 0 + 43.2 = 43.2
-3x + x2 = 43.2

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 43.2 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 43.2 + 2.25

Combine like terms: 43.2 + 2.25 = 45.45
2.25 + -3x + x2 = 45.45

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 45.45

Calculate the square root of the right side: 6.741661516

Break this problem into two subproblems by setting 
(x + -1.5) equal to 6.741661516 and -6.741661516.

Subproblem 1

x + -1.5 = 6.741661516 Simplifying x + -1.5 = 6.741661516 Reorder the terms: -1.5 + x = 6.741661516 Solving -1.5 + x = 6.741661516 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 6.741661516 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 6.741661516 + 1.5 x = 6.741661516 + 1.5 Combine like terms: 6.741661516 + 1.5 = 8.241661516 x = 8.241661516 Simplifying x = 8.241661516

Subproblem 2

x + -1.5 = -6.741661516 Simplifying x + -1.5 = -6.741661516 Reorder the terms: -1.5 + x = -6.741661516 Solving -1.5 + x = -6.741661516 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -6.741661516 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -6.741661516 + 1.5 x = -6.741661516 + 1.5 Combine like terms: -6.741661516 + 1.5 = -5.241661516 x = -5.241661516 Simplifying x = -5.241661516

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.241661516, -5.241661516}

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