3x-2x^2=0.28

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Solution for 3x-2x^2=0.28 equation:


Simplifying
3x + -2x2 = 0.28

Solving
3x + -2x2 = 0.28

Solving for variable 'x'.

Reorder the terms:
-0.28 + 3x + -2x2 = 0.28 + -0.28

Combine like terms: 0.28 + -0.28 = 0.00
-0.28 + 3x + -2x2 = 0.00

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
0.14 + -1.5x + x2 = 0.00

Move the constant term to the right:

Add '-0.14' to each side of the equation.
0.14 + -1.5x + -0.14 + x2 = 0.00 + -0.14

Reorder the terms:
0.14 + -0.14 + -1.5x + x2 = 0.00 + -0.14

Combine like terms: 0.14 + -0.14 = 0.00
0.00 + -1.5x + x2 = 0.00 + -0.14
-1.5x + x2 = 0.00 + -0.14

Combine like terms: 0.00 + -0.14 = -0.14
-1.5x + x2 = -0.14

The x term is -1.5x.  Take half its coefficient (-0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
-1.5x + 0.5625 + x2 = -0.14 + 0.5625

Reorder the terms:
0.5625 + -1.5x + x2 = -0.14 + 0.5625

Combine like terms: -0.14 + 0.5625 = 0.4225
0.5625 + -1.5x + x2 = 0.4225

Factor a perfect square on the left side:
(x + -0.75)(x + -0.75) = 0.4225

Calculate the square root of the right side: 0.65

Break this problem into two subproblems by setting 
(x + -0.75) equal to 0.65 and -0.65.

Subproblem 1

x + -0.75 = 0.65 Simplifying x + -0.75 = 0.65 Reorder the terms: -0.75 + x = 0.65 Solving -0.75 + x = 0.65 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = 0.65 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = 0.65 + 0.75 x = 0.65 + 0.75 Combine like terms: 0.65 + 0.75 = 1.4 x = 1.4 Simplifying x = 1.4

Subproblem 2

x + -0.75 = -0.65 Simplifying x + -0.75 = -0.65 Reorder the terms: -0.75 + x = -0.65 Solving -0.75 + x = -0.65 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = -0.65 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = -0.65 + 0.75 x = -0.65 + 0.75 Combine like terms: -0.65 + 0.75 = 0.1 x = 0.1 Simplifying x = 0.1

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.4, 0.1}

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