x^2-6x-75=0

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Solution for x^2-6x-75=0 equation:


Simplifying
x2 + -6x + -75 = 0

Reorder the terms:
-75 + -6x + x2 = 0

Solving
-75 + -6x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '75' to each side of the equation.
-75 + -6x + 75 + x2 = 0 + 75

Reorder the terms:
-75 + 75 + -6x + x2 = 0 + 75

Combine like terms: -75 + 75 = 0
0 + -6x + x2 = 0 + 75
-6x + x2 = 0 + 75

Combine like terms: 0 + 75 = 75
-6x + x2 = 75

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 = 75 + 9

Reorder the terms:
9 + -6x + x2 = 75 + 9

Combine like terms: 75 + 9 = 84
9 + -6x + x2 = 84

Factor a perfect square on the left side:
(x + -3)(x + -3) = 84

Calculate the square root of the right side: 9.16515139

Break this problem into two subproblems by setting 
(x + -3) equal to 9.16515139 and -9.16515139.

Subproblem 1

x + -3 = 9.16515139 Simplifying x + -3 = 9.16515139 Reorder the terms: -3 + x = 9.16515139 Solving -3 + x = 9.16515139 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 = 9.16515139 + 3 Combine like terms: -3 + 3 = 0 0 + x = 9.16515139 + 3 x = 9.16515139 + 3 Combine like terms: 9.16515139 + 3 = 12.16515139 x = 12.16515139 Simplifying x = 12.16515139

Subproblem 2

x + -3 = -9.16515139 Simplifying x + -3 = -9.16515139 Reorder the terms: -3 + x = -9.16515139 Solving -3 + x = -9.16515139 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 = -9.16515139 + 3 Combine like terms: -3 + 3 = 0 0 + x = -9.16515139 + 3 x = -9.16515139 + 3 Combine like terms: -9.16515139 + 3 = -6.16515139 x = -6.16515139 Simplifying x = -6.16515139

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.16515139, -6.16515139}

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