18x-16x^2=0.75

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Solution for 18x-16x^2=0.75 equation:


Simplifying
18x + -16x2 = 0.75

Solving
18x + -16x2 = 0.75

Solving for variable 'x'.

Reorder the terms:
-0.75 + 18x + -16x2 = 0.75 + -0.75

Combine like terms: 0.75 + -0.75 = 0.00
-0.75 + 18x + -16x2 = 0.00

Begin completing the square.  Divide all terms by
-16 the coefficient of the squared term: 

Divide each side by '-16'.
0.046875 + -1.125x + x2 = 0.00

Move the constant term to the right:

Add '-0.046875' to each side of the equation.
0.046875 + -1.125x + -0.046875 + x2 = 0.00 + -0.046875

Reorder the terms:
0.046875 + -0.046875 + -1.125x + x2 = 0.00 + -0.046875

Combine like terms: 0.046875 + -0.046875 = 0.000000
0.000000 + -1.125x + x2 = 0.00 + -0.046875
-1.125x + x2 = 0.00 + -0.046875

Combine like terms: 0.00 + -0.046875 = -0.046875
-1.125x + x2 = -0.046875

The x term is -1.125x.  Take half its coefficient (-0.5625).
Square it (0.31640625) and add it to both sides.

Add '0.31640625' to each side of the equation.
-1.125x + 0.31640625 + x2 = -0.046875 + 0.31640625

Reorder the terms:
0.31640625 + -1.125x + x2 = -0.046875 + 0.31640625

Combine like terms: -0.046875 + 0.31640625 = 0.26953125
0.31640625 + -1.125x + x2 = 0.26953125

Factor a perfect square on the left side:
(x + -0.5625)(x + -0.5625) = 0.26953125

Calculate the square root of the right side: 0.519163991

Break this problem into two subproblems by setting 
(x + -0.5625) equal to 0.519163991 and -0.519163991.

Subproblem 1

x + -0.5625 = 0.519163991 Simplifying x + -0.5625 = 0.519163991 Reorder the terms: -0.5625 + x = 0.519163991 Solving -0.5625 + x = 0.519163991 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5625' to each side of the equation. -0.5625 + 0.5625 + x = 0.519163991 + 0.5625 Combine like terms: -0.5625 + 0.5625 = 0.0000 0.0000 + x = 0.519163991 + 0.5625 x = 0.519163991 + 0.5625 Combine like terms: 0.519163991 + 0.5625 = 1.081663991 x = 1.081663991 Simplifying x = 1.081663991

Subproblem 2

x + -0.5625 = -0.519163991 Simplifying x + -0.5625 = -0.519163991 Reorder the terms: -0.5625 + x = -0.519163991 Solving -0.5625 + x = -0.519163991 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5625' to each side of the equation. -0.5625 + 0.5625 + x = -0.519163991 + 0.5625 Combine like terms: -0.5625 + 0.5625 = 0.0000 0.0000 + x = -0.519163991 + 0.5625 x = -0.519163991 + 0.5625 Combine like terms: -0.519163991 + 0.5625 = 0.043336009 x = 0.043336009 Simplifying x = 0.043336009

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.081663991, 0.043336009}

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