(.4x^2)-1.1x=2

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Solution for (.4x^2)-1.1x=2 equation:


Simplifying
(0.4x2) + -1.1x = 2

Reorder the terms:
-1.1x + (0.4x2) = 2

Solving
-1.1x + (0.4x2) = 2

Solving for variable 'x'.

Reorder the terms:
-2 + -1.1x + (0.4x2) = 2 + -2

Combine like terms: 2 + -2 = 0
-2 + -1.1x + (0.4x2) = 0

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

Divide each side by '0.4'.
-5 + -2.75x + x2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -2.75x + 5 + x2 = 0 + 5

Reorder the terms:
-5 + 5 + -2.75x + x2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -2.75x + x2 = 0 + 5
-2.75x + x2 = 0 + 5

Combine like terms: 0 + 5 = 5
-2.75x + x2 = 5

The x term is -2.75x.  Take half its coefficient (-1.375).
Square it (1.890625) and add it to both sides.

Add '1.890625' to each side of the equation.
-2.75x + 1.890625 + x2 = 5 + 1.890625

Reorder the terms:
1.890625 + -2.75x + x2 = 5 + 1.890625

Combine like terms: 5 + 1.890625 = 6.890625
1.890625 + -2.75x + x2 = 6.890625

Factor a perfect square on the left side:
((x) + -1.375)((x) + -1.375) = 6.890625

Calculate the square root of the right side: 2.625

Break this problem into two subproblems by setting 
((x) + -1.375) equal to 2.625 and -2.625.

Subproblem 1

(x) + -1.375 = 2.625 Simplifying (x) + -1.375 = 2.625 x + -1.375 = 2.625 Reorder the terms: -1.375 + x = 2.625 Solving -1.375 + x = 2.625 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.375' to each side of the equation. -1.375 + 1.375 + x = 2.625 + 1.375 Combine like terms: -1.375 + 1.375 = 0.000 0.000 + x = 2.625 + 1.375 x = 2.625 + 1.375 Combine like terms: 2.625 + 1.375 = 4 x = 4 Simplifying x = 4

Subproblem 2

(x) + -1.375 = -2.625 Simplifying (x) + -1.375 = -2.625 x + -1.375 = -2.625 Reorder the terms: -1.375 + x = -2.625 Solving -1.375 + x = -2.625 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.375' to each side of the equation. -1.375 + 1.375 + x = -2.625 + 1.375 Combine like terms: -1.375 + 1.375 = 0.000 0.000 + x = -2.625 + 1.375 x = -2.625 + 1.375 Combine like terms: -2.625 + 1.375 = -1.25 x = -1.25 Simplifying x = -1.25

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4, -1.25}

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