1.12=2x^2+5.6x

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Solution for 1.12=2x^2+5.6x equation:


Simplifying
1.12 = 2x2 + 5.6x

Reorder the terms:
1.12 = 5.6x + 2x2

Solving
1.12 = 5.6x + 2x2

Solving for variable 'x'.

Reorder the terms:
1.12 + -5.6x + -2x2 = 5.6x + -5.6x + 2x2 + -2x2

Combine like terms: 5.6x + -5.6x = 0.0
1.12 + -5.6x + -2x2 = 0.0 + 2x2 + -2x2
1.12 + -5.6x + -2x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
1.12 + -5.6x + -2x2 = 0

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

Divide each side by '-2'.
-0.56 + 2.8x + x2 = 0

Move the constant term to the right:

Add '0.56' to each side of the equation.
-0.56 + 2.8x + 0.56 + x2 = 0 + 0.56

Reorder the terms:
-0.56 + 0.56 + 2.8x + x2 = 0 + 0.56

Combine like terms: -0.56 + 0.56 = 0.00
0.00 + 2.8x + x2 = 0 + 0.56
2.8x + x2 = 0 + 0.56

Combine like terms: 0 + 0.56 = 0.56
2.8x + x2 = 0.56

The x term is 2.8x.  Take half its coefficient (1.4).
Square it (1.96) and add it to both sides.

Add '1.96' to each side of the equation.
2.8x + 1.96 + x2 = 0.56 + 1.96

Reorder the terms:
1.96 + 2.8x + x2 = 0.56 + 1.96

Combine like terms: 0.56 + 1.96 = 2.52
1.96 + 2.8x + x2 = 2.52

Factor a perfect square on the left side:
(x + 1.4)(x + 1.4) = 2.52

Calculate the square root of the right side: 1.587450787

Break this problem into two subproblems by setting 
(x + 1.4) equal to 1.587450787 and -1.587450787.

Subproblem 1

x + 1.4 = 1.587450787 Simplifying x + 1.4 = 1.587450787 Reorder the terms: 1.4 + x = 1.587450787 Solving 1.4 + x = 1.587450787 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.4' to each side of the equation. 1.4 + -1.4 + x = 1.587450787 + -1.4 Combine like terms: 1.4 + -1.4 = 0.0 0.0 + x = 1.587450787 + -1.4 x = 1.587450787 + -1.4 Combine like terms: 1.587450787 + -1.4 = 0.187450787 x = 0.187450787 Simplifying x = 0.187450787

Subproblem 2

x + 1.4 = -1.587450787 Simplifying x + 1.4 = -1.587450787 Reorder the terms: 1.4 + x = -1.587450787 Solving 1.4 + x = -1.587450787 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.4' to each side of the equation. 1.4 + -1.4 + x = -1.587450787 + -1.4 Combine like terms: 1.4 + -1.4 = 0.0 0.0 + x = -1.587450787 + -1.4 x = -1.587450787 + -1.4 Combine like terms: -1.587450787 + -1.4 = -2.987450787 x = -2.987450787 Simplifying x = -2.987450787

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.187450787, -2.987450787}

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