5x^2-30x-36=0

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Solution for 5x^2-30x-36=0 equation:


Simplifying
5x2 + -30x + -36 = 0

Reorder the terms:
-36 + -30x + 5x2 = 0

Solving
-36 + -30x + 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 + -6x + x2 = 0

Move the constant term to the right:

Add '7.2' to each side of the equation.
-7.2 + -6x + 7.2 + x2 = 0 + 7.2

Reorder the terms:
-7.2 + 7.2 + -6x + x2 = 0 + 7.2

Combine like terms: -7.2 + 7.2 = 0.0
0.0 + -6x + x2 = 0 + 7.2
-6x + x2 = 0 + 7.2

Combine like terms: 0 + 7.2 = 7.2
-6x + x2 = 7.2

The x term is -6x.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6x + 9 + x2 = 7.2 + 9

Reorder the terms:
9 + -6x + x2 = 7.2 + 9

Combine like terms: 7.2 + 9 = 16.2
9 + -6x + x2 = 16.2

Factor a perfect square on the left side:
(x + -3)(x + -3) = 16.2

Calculate the square root of the right side: 4.02492236

Break this problem into two subproblems by setting 
(x + -3) equal to 4.02492236 and -4.02492236.

Subproblem 1

x + -3 = 4.02492236 Simplifying x + -3 = 4.02492236 Reorder the terms: -3 + x = 4.02492236 Solving -3 + x = 4.02492236 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = 4.02492236 + 3 Combine like terms: -3 + 3 = 0 0 + x = 4.02492236 + 3 x = 4.02492236 + 3 Combine like terms: 4.02492236 + 3 = 7.02492236 x = 7.02492236 Simplifying x = 7.02492236

Subproblem 2

x + -3 = -4.02492236 Simplifying x + -3 = -4.02492236 Reorder the terms: -3 + x = -4.02492236 Solving -3 + x = -4.02492236 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = -4.02492236 + 3 Combine like terms: -3 + 3 = 0 0 + x = -4.02492236 + 3 x = -4.02492236 + 3 Combine like terms: -4.02492236 + 3 = -1.02492236 x = -1.02492236 Simplifying x = -1.02492236

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.02492236, -1.02492236}

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