81x^2-36x-36x+16=48

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Solution for 81x^2-36x-36x+16=48 equation:


Simplifying
81x2 + -36x + -36x + 16 = 48

Reorder the terms:
16 + -36x + -36x + 81x2 = 48

Combine like terms: -36x + -36x = -72x
16 + -72x + 81x2 = 48

Solving
16 + -72x + 81x2 = 48

Solving for variable 'x'.

Reorder the terms:
16 + -48 + -72x + 81x2 = 48 + -48

Combine like terms: 16 + -48 = -32
-32 + -72x + 81x2 = 48 + -48

Combine like terms: 48 + -48 = 0
-32 + -72x + 81x2 = 0

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

Divide each side by '81'.
-0.3950617284 + -0.8888888889x + x2 = 0

Move the constant term to the right:

Add '0.3950617284' to each side of the equation.
-0.3950617284 + -0.8888888889x + 0.3950617284 + x2 = 0 + 0.3950617284

Reorder the terms:
-0.3950617284 + 0.3950617284 + -0.8888888889x + x2 = 0 + 0.3950617284

Combine like terms: -0.3950617284 + 0.3950617284 = 0.0000000000
0.0000000000 + -0.8888888889x + x2 = 0 + 0.3950617284
-0.8888888889x + x2 = 0 + 0.3950617284

Combine like terms: 0 + 0.3950617284 = 0.3950617284
-0.8888888889x + x2 = 0.3950617284

The x term is -0.8888888889x.  Take half its coefficient (-0.4444444445).
Square it (0.1975308642) and add it to both sides.

Add '0.1975308642' to each side of the equation.
-0.8888888889x + 0.1975308642 + x2 = 0.3950617284 + 0.1975308642

Reorder the terms:
0.1975308642 + -0.8888888889x + x2 = 0.3950617284 + 0.1975308642

Combine like terms: 0.3950617284 + 0.1975308642 = 0.5925925926
0.1975308642 + -0.8888888889x + x2 = 0.5925925926

Factor a perfect square on the left side:
(x + -0.4444444445)(x + -0.4444444445) = 0.5925925926

Calculate the square root of the right side: 0.769800359

Break this problem into two subproblems by setting 
(x + -0.4444444445) equal to 0.769800359 and -0.769800359.

Subproblem 1

x + -0.4444444445 = 0.769800359 Simplifying x + -0.4444444445 = 0.769800359 Reorder the terms: -0.4444444445 + x = 0.769800359 Solving -0.4444444445 + x = 0.769800359 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4444444445' to each side of the equation. -0.4444444445 + 0.4444444445 + x = 0.769800359 + 0.4444444445 Combine like terms: -0.4444444445 + 0.4444444445 = 0.0000000000 0.0000000000 + x = 0.769800359 + 0.4444444445 x = 0.769800359 + 0.4444444445 Combine like terms: 0.769800359 + 0.4444444445 = 1.2142448035 x = 1.2142448035 Simplifying x = 1.2142448035

Subproblem 2

x + -0.4444444445 = -0.769800359 Simplifying x + -0.4444444445 = -0.769800359 Reorder the terms: -0.4444444445 + x = -0.769800359 Solving -0.4444444445 + x = -0.769800359 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4444444445' to each side of the equation. -0.4444444445 + 0.4444444445 + x = -0.769800359 + 0.4444444445 Combine like terms: -0.4444444445 + 0.4444444445 = 0.0000000000 0.0000000000 + x = -0.769800359 + 0.4444444445 x = -0.769800359 + 0.4444444445 Combine like terms: -0.769800359 + 0.4444444445 = -0.3253559145 x = -0.3253559145 Simplifying x = -0.3253559145

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.2142448035, -0.3253559145}

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