-2.2=(x*x)-3.2x

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Solution for -2.2=(x*x)-3.2x equation:


Simplifying
-2.2 = (x * x) + -3.2x

Multiply x * x
-2.2 = (x2) + -3.2x
-2.2 = x2 + -3.2x

Reorder the terms:
-2.2 = -3.2x + x2

Solving
-2.2 = -3.2x + x2

Solving for variable 'x'.

Reorder the terms:
-2.2 + 3.2x + -1x2 = -3.2x + 3.2x + x2 + -1x2

Combine like terms: -3.2x + 3.2x = 0.0
-2.2 + 3.2x + -1x2 = 0.0 + x2 + -1x2
-2.2 + 3.2x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-2.2 + 3.2x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
2.2 + -3.2x + x2 = 0

Move the constant term to the right:

Add '-2.2' to each side of the equation.
2.2 + -3.2x + -2.2 + x2 = 0 + -2.2

Reorder the terms:
2.2 + -2.2 + -3.2x + x2 = 0 + -2.2

Combine like terms: 2.2 + -2.2 = 0.0
0.0 + -3.2x + x2 = 0 + -2.2
-3.2x + x2 = 0 + -2.2

Combine like terms: 0 + -2.2 = -2.2
-3.2x + x2 = -2.2

The x term is -3.2x.  Take half its coefficient (-1.6).
Square it (2.56) and add it to both sides.

Add '2.56' to each side of the equation.
-3.2x + 2.56 + x2 = -2.2 + 2.56

Reorder the terms:
2.56 + -3.2x + x2 = -2.2 + 2.56

Combine like terms: -2.2 + 2.56 = 0.36
2.56 + -3.2x + x2 = 0.36

Factor a perfect square on the left side:
(x + -1.6)(x + -1.6) = 0.36

Calculate the square root of the right side: 0.6

Break this problem into two subproblems by setting 
(x + -1.6) equal to 0.6 and -0.6.

Subproblem 1

x + -1.6 = 0.6 Simplifying x + -1.6 = 0.6 Reorder the terms: -1.6 + x = 0.6 Solving -1.6 + x = 0.6 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.6' to each side of the equation. -1.6 + 1.6 + x = 0.6 + 1.6 Combine like terms: -1.6 + 1.6 = 0.0 0.0 + x = 0.6 + 1.6 x = 0.6 + 1.6 Combine like terms: 0.6 + 1.6 = 2.2 x = 2.2 Simplifying x = 2.2

Subproblem 2

x + -1.6 = -0.6 Simplifying x + -1.6 = -0.6 Reorder the terms: -1.6 + x = -0.6 Solving -1.6 + x = -0.6 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.6' to each side of the equation. -1.6 + 1.6 + x = -0.6 + 1.6 Combine like terms: -1.6 + 1.6 = 0.0 0.0 + x = -0.6 + 1.6 x = -0.6 + 1.6 Combine like terms: -0.6 + 1.6 = 1 x = 1 Simplifying x = 1

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.2, 1}

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