18x^2+7x-10=0

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Solution for 18x^2+7x-10=0 equation:


Simplifying
18x2 + 7x + -10 = 0

Reorder the terms:
-10 + 7x + 18x2 = 0

Solving
-10 + 7x + 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 + 0.3888888889x + x2 = 0

Move the constant term to the right:

Add '0.5555555556' to each side of the equation.
-0.5555555556 + 0.3888888889x + 0.5555555556 + x2 = 0 + 0.5555555556

Reorder the terms:
-0.5555555556 + 0.5555555556 + 0.3888888889x + x2 = 0 + 0.5555555556

Combine like terms: -0.5555555556 + 0.5555555556 = 0.0000000000
0.0000000000 + 0.3888888889x + x2 = 0 + 0.5555555556
0.3888888889x + x2 = 0 + 0.5555555556

Combine like terms: 0 + 0.5555555556 = 0.5555555556
0.3888888889x + x2 = 0.5555555556

The x term is 0.3888888889x.  Take half its coefficient (0.1944444445).
Square it (0.03780864200) and add it to both sides.

Add '0.03780864200' to each side of the equation.
0.3888888889x + 0.03780864200 + x2 = 0.5555555556 + 0.03780864200

Reorder the terms:
0.03780864200 + 0.3888888889x + x2 = 0.5555555556 + 0.03780864200

Combine like terms: 0.5555555556 + 0.03780864200 = 0.5933641976
0.03780864200 + 0.3888888889x + x2 = 0.5933641976

Factor a perfect square on the left side:
(x + 0.1944444445)(x + 0.1944444445) = 0.5933641976

Calculate the square root of the right side: 0.770301368

Break this problem into two subproblems by setting 
(x + 0.1944444445) equal to 0.770301368 and -0.770301368.

Subproblem 1

x + 0.1944444445 = 0.770301368 Simplifying x + 0.1944444445 = 0.770301368 Reorder the terms: 0.1944444445 + x = 0.770301368 Solving 0.1944444445 + x = 0.770301368 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1944444445' to each side of the equation. 0.1944444445 + -0.1944444445 + x = 0.770301368 + -0.1944444445 Combine like terms: 0.1944444445 + -0.1944444445 = 0.0000000000 0.0000000000 + x = 0.770301368 + -0.1944444445 x = 0.770301368 + -0.1944444445 Combine like terms: 0.770301368 + -0.1944444445 = 0.5758569235 x = 0.5758569235 Simplifying x = 0.5758569235

Subproblem 2

x + 0.1944444445 = -0.770301368 Simplifying x + 0.1944444445 = -0.770301368 Reorder the terms: 0.1944444445 + x = -0.770301368 Solving 0.1944444445 + x = -0.770301368 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1944444445' to each side of the equation. 0.1944444445 + -0.1944444445 + x = -0.770301368 + -0.1944444445 Combine like terms: 0.1944444445 + -0.1944444445 = 0.0000000000 0.0000000000 + x = -0.770301368 + -0.1944444445 x = -0.770301368 + -0.1944444445 Combine like terms: -0.770301368 + -0.1944444445 = -0.9647458125 x = -0.9647458125 Simplifying x = -0.9647458125

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.5758569235, -0.9647458125}

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