5x^2-18x-75=0

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Solution for 5x^2-18x-75=0 equation:


Simplifying
5x2 + -18x + -75 = 0

Reorder the terms:
-75 + -18x + 5x2 = 0

Solving
-75 + -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'.
-15 + -3.6x + x2 = 0

Move the constant term to the right:

Add '15' to each side of the equation.
-15 + -3.6x + 15 + x2 = 0 + 15

Reorder the terms:
-15 + 15 + -3.6x + x2 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + -3.6x + x2 = 0 + 15
-3.6x + x2 = 0 + 15

Combine like terms: 0 + 15 = 15
-3.6x + x2 = 15

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 = 15 + 3.24

Reorder the terms:
3.24 + -3.6x + x2 = 15 + 3.24

Combine like terms: 15 + 3.24 = 18.24
3.24 + -3.6x + x2 = 18.24

Factor a perfect square on the left side:
(x + -1.8)(x + -1.8) = 18.24

Calculate the square root of the right side: 4.270831301

Break this problem into two subproblems by setting 
(x + -1.8) equal to 4.270831301 and -4.270831301.

Subproblem 1

x + -1.8 = 4.270831301 Simplifying x + -1.8 = 4.270831301 Reorder the terms: -1.8 + x = 4.270831301 Solving -1.8 + x = 4.270831301 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 = 4.270831301 + 1.8 Combine like terms: -1.8 + 1.8 = 0.0 0.0 + x = 4.270831301 + 1.8 x = 4.270831301 + 1.8 Combine like terms: 4.270831301 + 1.8 = 6.070831301 x = 6.070831301 Simplifying x = 6.070831301

Subproblem 2

x + -1.8 = -4.270831301 Simplifying x + -1.8 = -4.270831301 Reorder the terms: -1.8 + x = -4.270831301 Solving -1.8 + x = -4.270831301 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 = -4.270831301 + 1.8 Combine like terms: -1.8 + 1.8 = 0.0 0.0 + x = -4.270831301 + 1.8 x = -4.270831301 + 1.8 Combine like terms: -4.270831301 + 1.8 = -2.470831301 x = -2.470831301 Simplifying x = -2.470831301

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.070831301, -2.470831301}

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