81x^2-118x+36=0

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Solution for 81x^2-118x+36=0 equation:


Simplifying
81x2 + -118x + 36 = 0

Reorder the terms:
36 + -118x + 81x2 = 0

Solving
36 + -118x + 81x2 = 0

Solving for variable 'x'.

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

Divide each side by '81'.
0.4444444444 + -1.456790123x + x2 = 0

Move the constant term to the right:

Add '-0.4444444444' to each side of the equation.
0.4444444444 + -1.456790123x + -0.4444444444 + x2 = 0 + -0.4444444444

Reorder the terms:
0.4444444444 + -0.4444444444 + -1.456790123x + x2 = 0 + -0.4444444444

Combine like terms: 0.4444444444 + -0.4444444444 = 0.0000000000
0.0000000000 + -1.456790123x + x2 = 0 + -0.4444444444
-1.456790123x + x2 = 0 + -0.4444444444

Combine like terms: 0 + -0.4444444444 = -0.4444444444
-1.456790123x + x2 = -0.4444444444

The x term is -1.456790123x.  Take half its coefficient (-0.7283950615).
Square it (0.5305593656) and add it to both sides.

Add '0.5305593656' to each side of the equation.
-1.456790123x + 0.5305593656 + x2 = -0.4444444444 + 0.5305593656

Reorder the terms:
0.5305593656 + -1.456790123x + x2 = -0.4444444444 + 0.5305593656

Combine like terms: -0.4444444444 + 0.5305593656 = 0.0861149212
0.5305593656 + -1.456790123x + x2 = 0.0861149212

Factor a perfect square on the left side:
(x + -0.7283950615)(x + -0.7283950615) = 0.0861149212

Calculate the square root of the right side: 0.29345344

Break this problem into two subproblems by setting 
(x + -0.7283950615) equal to 0.29345344 and -0.29345344.

Subproblem 1

x + -0.7283950615 = 0.29345344 Simplifying x + -0.7283950615 = 0.29345344 Reorder the terms: -0.7283950615 + x = 0.29345344 Solving -0.7283950615 + x = 0.29345344 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7283950615' to each side of the equation. -0.7283950615 + 0.7283950615 + x = 0.29345344 + 0.7283950615 Combine like terms: -0.7283950615 + 0.7283950615 = 0.0000000000 0.0000000000 + x = 0.29345344 + 0.7283950615 x = 0.29345344 + 0.7283950615 Combine like terms: 0.29345344 + 0.7283950615 = 1.0218485015 x = 1.0218485015 Simplifying x = 1.0218485015

Subproblem 2

x + -0.7283950615 = -0.29345344 Simplifying x + -0.7283950615 = -0.29345344 Reorder the terms: -0.7283950615 + x = -0.29345344 Solving -0.7283950615 + x = -0.29345344 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7283950615' to each side of the equation. -0.7283950615 + 0.7283950615 + x = -0.29345344 + 0.7283950615 Combine like terms: -0.7283950615 + 0.7283950615 = 0.0000000000 0.0000000000 + x = -0.29345344 + 0.7283950615 x = -0.29345344 + 0.7283950615 Combine like terms: -0.29345344 + 0.7283950615 = 0.4349416215 x = 0.4349416215 Simplifying x = 0.4349416215

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.0218485015, 0.4349416215}

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