-4.9x^2+2.8x+1.12=0

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Solution for -4.9x^2+2.8x+1.12=0 equation:


Simplifying
-4.9x2 + 2.8x + 1.12 = 0

Reorder the terms:
1.12 + 2.8x + -4.9x2 = 0

Solving
1.12 + 2.8x + -4.9x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-4.9 the coefficient of the squared term: 

Divide each side by '-4.9'.
-0.2285714286 + -0.5714285714x + x2 = 0

Move the constant term to the right:

Add '0.2285714286' to each side of the equation.
-0.2285714286 + -0.5714285714x + 0.2285714286 + x2 = 0 + 0.2285714286

Reorder the terms:
-0.2285714286 + 0.2285714286 + -0.5714285714x + x2 = 0 + 0.2285714286

Combine like terms: -0.2285714286 + 0.2285714286 = 0.0000000000
0.0000000000 + -0.5714285714x + x2 = 0 + 0.2285714286
-0.5714285714x + x2 = 0 + 0.2285714286

Combine like terms: 0 + 0.2285714286 = 0.2285714286
-0.5714285714x + x2 = 0.2285714286

The x term is -0.5714285714x.  Take half its coefficient (-0.2857142857).
Square it (0.08163265305) and add it to both sides.

Add '0.08163265305' to each side of the equation.
-0.5714285714x + 0.08163265305 + x2 = 0.2285714286 + 0.08163265305

Reorder the terms:
0.08163265305 + -0.5714285714x + x2 = 0.2285714286 + 0.08163265305

Combine like terms: 0.2285714286 + 0.08163265305 = 0.31020408165
0.08163265305 + -0.5714285714x + x2 = 0.31020408165

Factor a perfect square on the left side:
(x + -0.2857142857)(x + -0.2857142857) = 0.31020408165

Calculate the square root of the right side: 0.556959677

Break this problem into two subproblems by setting 
(x + -0.2857142857) equal to 0.556959677 and -0.556959677.

Subproblem 1

x + -0.2857142857 = 0.556959677 Simplifying x + -0.2857142857 = 0.556959677 Reorder the terms: -0.2857142857 + x = 0.556959677 Solving -0.2857142857 + x = 0.556959677 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2857142857' to each side of the equation. -0.2857142857 + 0.2857142857 + x = 0.556959677 + 0.2857142857 Combine like terms: -0.2857142857 + 0.2857142857 = 0.0000000000 0.0000000000 + x = 0.556959677 + 0.2857142857 x = 0.556959677 + 0.2857142857 Combine like terms: 0.556959677 + 0.2857142857 = 0.8426739627 x = 0.8426739627 Simplifying x = 0.8426739627

Subproblem 2

x + -0.2857142857 = -0.556959677 Simplifying x + -0.2857142857 = -0.556959677 Reorder the terms: -0.2857142857 + x = -0.556959677 Solving -0.2857142857 + x = -0.556959677 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2857142857' to each side of the equation. -0.2857142857 + 0.2857142857 + x = -0.556959677 + 0.2857142857 Combine like terms: -0.2857142857 + 0.2857142857 = 0.0000000000 0.0000000000 + x = -0.556959677 + 0.2857142857 x = -0.556959677 + 0.2857142857 Combine like terms: -0.556959677 + 0.2857142857 = -0.2712453913 x = -0.2712453913 Simplifying x = -0.2712453913

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.8426739627, -0.2712453913}

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