3=8x-4.9x^2

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Solution for 3=8x-4.9x^2 equation:


Simplifying
3 = 8x + -4.9x2

Solving
3 = 8x + -4.9x2

Solving for variable 'x'.

Reorder the terms:
3 + -8x + 4.9x2 = 8x + -8x + -4.9x2 + 4.9x2

Combine like terms: 8x + -8x = 0
3 + -8x + 4.9x2 = 0 + -4.9x2 + 4.9x2
3 + -8x + 4.9x2 = -4.9x2 + 4.9x2

Combine like terms: -4.9x2 + 4.9x2 = 0.0
3 + -8x + 4.9x2 = 0.0

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

Divide each side by '4.9'.
0.612244898 + -1.632653061x + x2 = 0

Move the constant term to the right:

Add '-0.612244898' to each side of the equation.
0.612244898 + -1.632653061x + -0.612244898 + x2 = 0 + -0.612244898

Reorder the terms:
0.612244898 + -0.612244898 + -1.632653061x + x2 = 0 + -0.612244898

Combine like terms: 0.612244898 + -0.612244898 = 0.000000000
0.000000000 + -1.632653061x + x2 = 0 + -0.612244898
-1.632653061x + x2 = 0 + -0.612244898

Combine like terms: 0 + -0.612244898 = -0.612244898
-1.632653061x + x2 = -0.612244898

The x term is -1.632653061x.  Take half its coefficient (-0.8163265305).
Square it (0.6663890044) and add it to both sides.

Add '0.6663890044' to each side of the equation.
-1.632653061x + 0.6663890044 + x2 = -0.612244898 + 0.6663890044

Reorder the terms:
0.6663890044 + -1.632653061x + x2 = -0.612244898 + 0.6663890044

Combine like terms: -0.612244898 + 0.6663890044 = 0.0541441064
0.6663890044 + -1.632653061x + x2 = 0.0541441064

Factor a perfect square on the left side:
(x + -0.8163265305)(x + -0.8163265305) = 0.0541441064

Calculate the square root of the right side: 0.232688862

Break this problem into two subproblems by setting 
(x + -0.8163265305) equal to 0.232688862 and -0.232688862.

Subproblem 1

x + -0.8163265305 = 0.232688862 Simplifying x + -0.8163265305 = 0.232688862 Reorder the terms: -0.8163265305 + x = 0.232688862 Solving -0.8163265305 + x = 0.232688862 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8163265305' to each side of the equation. -0.8163265305 + 0.8163265305 + x = 0.232688862 + 0.8163265305 Combine like terms: -0.8163265305 + 0.8163265305 = 0.0000000000 0.0000000000 + x = 0.232688862 + 0.8163265305 x = 0.232688862 + 0.8163265305 Combine like terms: 0.232688862 + 0.8163265305 = 1.0490153925 x = 1.0490153925 Simplifying x = 1.0490153925

Subproblem 2

x + -0.8163265305 = -0.232688862 Simplifying x + -0.8163265305 = -0.232688862 Reorder the terms: -0.8163265305 + x = -0.232688862 Solving -0.8163265305 + x = -0.232688862 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8163265305' to each side of the equation. -0.8163265305 + 0.8163265305 + x = -0.232688862 + 0.8163265305 Combine like terms: -0.8163265305 + 0.8163265305 = 0.0000000000 0.0000000000 + x = -0.232688862 + 0.8163265305 x = -0.232688862 + 0.8163265305 Combine like terms: -0.232688862 + 0.8163265305 = 0.5836376685 x = 0.5836376685 Simplifying x = 0.5836376685

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.0490153925, 0.5836376685}

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