2x(x-3)=1.2+x

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Solution for 2x(x-3)=1.2+x equation:


Simplifying
2x(x + -3) = 1.2 + x

Reorder the terms:
2x(-3 + x) = 1.2 + x
(-3 * 2x + x * 2x) = 1.2 + x
(-6x + 2x2) = 1.2 + x

Solving
-6x + 2x2 = 1.2 + x

Solving for variable 'x'.

Reorder the terms:
-1.2 + -6x + -1x + 2x2 = 1.2 + x + -1.2 + -1x

Combine like terms: -6x + -1x = -7x
-1.2 + -7x + 2x2 = 1.2 + x + -1.2 + -1x

Reorder the terms:
-1.2 + -7x + 2x2 = 1.2 + -1.2 + x + -1x

Combine like terms: 1.2 + -1.2 = 0.0
-1.2 + -7x + 2x2 = 0.0 + x + -1x
-1.2 + -7x + 2x2 = x + -1x

Combine like terms: x + -1x = 0
-1.2 + -7x + 2x2 = 0

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

Divide each side by '2'.
-0.6 + -3.5x + x2 = 0

Move the constant term to the right:

Add '0.6' to each side of the equation.
-0.6 + -3.5x + 0.6 + x2 = 0 + 0.6

Reorder the terms:
-0.6 + 0.6 + -3.5x + x2 = 0 + 0.6

Combine like terms: -0.6 + 0.6 = 0.0
0.0 + -3.5x + x2 = 0 + 0.6
-3.5x + x2 = 0 + 0.6

Combine like terms: 0 + 0.6 = 0.6
-3.5x + x2 = 0.6

The x term is -3.5x.  Take half its coefficient (-1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
-3.5x + 3.0625 + x2 = 0.6 + 3.0625

Reorder the terms:
3.0625 + -3.5x + x2 = 0.6 + 3.0625

Combine like terms: 0.6 + 3.0625 = 3.6625
3.0625 + -3.5x + x2 = 3.6625

Factor a perfect square on the left side:
(x + -1.75)(x + -1.75) = 3.6625

Calculate the square root of the right side: 1.913765921

Break this problem into two subproblems by setting 
(x + -1.75) equal to 1.913765921 and -1.913765921.

Subproblem 1

x + -1.75 = 1.913765921 Simplifying x + -1.75 = 1.913765921 Reorder the terms: -1.75 + x = 1.913765921 Solving -1.75 + x = 1.913765921 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = 1.913765921 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = 1.913765921 + 1.75 x = 1.913765921 + 1.75 Combine like terms: 1.913765921 + 1.75 = 3.663765921 x = 3.663765921 Simplifying x = 3.663765921

Subproblem 2

x + -1.75 = -1.913765921 Simplifying x + -1.75 = -1.913765921 Reorder the terms: -1.75 + x = -1.913765921 Solving -1.75 + x = -1.913765921 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = -1.913765921 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = -1.913765921 + 1.75 x = -1.913765921 + 1.75 Combine like terms: -1.913765921 + 1.75 = -0.163765921 x = -0.163765921 Simplifying x = -0.163765921

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.663765921, -0.163765921}

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