18x^2-45x-10=0

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Solution for 18x^2-45x-10=0 equation:


Simplifying
18x2 + -45x + -10 = 0

Reorder the terms:
-10 + -45x + 18x2 = 0

Solving
-10 + -45x + 18x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
18 the coefficient of the squared term: 

Divide each side by '18'.
-0.5555555556 + -2.5x + x2 = 0

Move the constant term to the right:

Add '0.5555555556' to each side of the equation.
-0.5555555556 + -2.5x + 0.5555555556 + x2 = 0 + 0.5555555556

Reorder the terms:
-0.5555555556 + 0.5555555556 + -2.5x + x2 = 0 + 0.5555555556

Combine like terms: -0.5555555556 + 0.5555555556 = 0.0000000000
0.0000000000 + -2.5x + x2 = 0 + 0.5555555556
-2.5x + x2 = 0 + 0.5555555556

Combine like terms: 0 + 0.5555555556 = 0.5555555556
-2.5x + x2 = 0.5555555556

The x term is -2.5x.  Take half its coefficient (-1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
-2.5x + 1.5625 + x2 = 0.5555555556 + 1.5625

Reorder the terms:
1.5625 + -2.5x + x2 = 0.5555555556 + 1.5625

Combine like terms: 0.5555555556 + 1.5625 = 2.1180555556
1.5625 + -2.5x + x2 = 2.1180555556

Factor a perfect square on the left side:
(x + -1.25)(x + -1.25) = 2.1180555556

Calculate the square root of the right side: 1.4553541

Break this problem into two subproblems by setting 
(x + -1.25) equal to 1.4553541 and -1.4553541.

Subproblem 1

x + -1.25 = 1.4553541 Simplifying x + -1.25 = 1.4553541 Reorder the terms: -1.25 + x = 1.4553541 Solving -1.25 + x = 1.4553541 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = 1.4553541 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = 1.4553541 + 1.25 x = 1.4553541 + 1.25 Combine like terms: 1.4553541 + 1.25 = 2.7053541 x = 2.7053541 Simplifying x = 2.7053541

Subproblem 2

x + -1.25 = -1.4553541 Simplifying x + -1.25 = -1.4553541 Reorder the terms: -1.25 + x = -1.4553541 Solving -1.25 + x = -1.4553541 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = -1.4553541 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = -1.4553541 + 1.25 x = -1.4553541 + 1.25 Combine like terms: -1.4553541 + 1.25 = -0.2053541 x = -0.2053541 Simplifying x = -0.2053541

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.7053541, -0.2053541}

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