5x^2-27x-36=0

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Solution for 5x^2-27x-36=0 equation:


Simplifying
5x2 + -27x + -36 = 0

Reorder the terms:
-36 + -27x + 5x2 = 0

Solving
-36 + -27x + 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'.
-7.2 + -5.4x + x2 = 0

Move the constant term to the right:

Add '7.2' to each side of the equation.
-7.2 + -5.4x + 7.2 + x2 = 0 + 7.2

Reorder the terms:
-7.2 + 7.2 + -5.4x + x2 = 0 + 7.2

Combine like terms: -7.2 + 7.2 = 0.0
0.0 + -5.4x + x2 = 0 + 7.2
-5.4x + x2 = 0 + 7.2

Combine like terms: 0 + 7.2 = 7.2
-5.4x + x2 = 7.2

The x term is -5.4x.  Take half its coefficient (-2.7).
Square it (7.29) and add it to both sides.

Add '7.29' to each side of the equation.
-5.4x + 7.29 + x2 = 7.2 + 7.29

Reorder the terms:
7.29 + -5.4x + x2 = 7.2 + 7.29

Combine like terms: 7.2 + 7.29 = 14.49
7.29 + -5.4x + x2 = 14.49

Factor a perfect square on the left side:
(x + -2.7)(x + -2.7) = 14.49

Calculate the square root of the right side: 3.806573262

Break this problem into two subproblems by setting 
(x + -2.7) equal to 3.806573262 and -3.806573262.

Subproblem 1

x + -2.7 = 3.806573262 Simplifying x + -2.7 = 3.806573262 Reorder the terms: -2.7 + x = 3.806573262 Solving -2.7 + x = 3.806573262 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.7' to each side of the equation. -2.7 + 2.7 + x = 3.806573262 + 2.7 Combine like terms: -2.7 + 2.7 = 0.0 0.0 + x = 3.806573262 + 2.7 x = 3.806573262 + 2.7 Combine like terms: 3.806573262 + 2.7 = 6.506573262 x = 6.506573262 Simplifying x = 6.506573262

Subproblem 2

x + -2.7 = -3.806573262 Simplifying x + -2.7 = -3.806573262 Reorder the terms: -2.7 + x = -3.806573262 Solving -2.7 + x = -3.806573262 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.7' to each side of the equation. -2.7 + 2.7 + x = -3.806573262 + 2.7 Combine like terms: -2.7 + 2.7 = 0.0 0.0 + x = -3.806573262 + 2.7 x = -3.806573262 + 2.7 Combine like terms: -3.806573262 + 2.7 = -1.106573262 x = -1.106573262 Simplifying x = -1.106573262

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.506573262, -1.106573262}

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