4.9x^2-16x-8=0

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Solution for 4.9x^2-16x-8=0 equation:


Simplifying
4.9x2 + -16x + -8 = 0

Reorder the terms:
-8 + -16x + 4.9x2 = 0

Solving
-8 + -16x + 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'.
-1.632653061 + -3.265306122x + x2 = 0

Move the constant term to the right:

Add '1.632653061' to each side of the equation.
-1.632653061 + -3.265306122x + 1.632653061 + x2 = 0 + 1.632653061

Reorder the terms:
-1.632653061 + 1.632653061 + -3.265306122x + x2 = 0 + 1.632653061

Combine like terms: -1.632653061 + 1.632653061 = 0.000000000
0.000000000 + -3.265306122x + x2 = 0 + 1.632653061
-3.265306122x + x2 = 0 + 1.632653061

Combine like terms: 0 + 1.632653061 = 1.632653061
-3.265306122x + x2 = 1.632653061

The x term is -3.265306122x.  Take half its coefficient (-1.632653061).
Square it (2.665556018) and add it to both sides.

Add '2.665556018' to each side of the equation.
-3.265306122x + 2.665556018 + x2 = 1.632653061 + 2.665556018

Reorder the terms:
2.665556018 + -3.265306122x + x2 = 1.632653061 + 2.665556018

Combine like terms: 1.632653061 + 2.665556018 = 4.298209079
2.665556018 + -3.265306122x + x2 = 4.298209079

Factor a perfect square on the left side:
(x + -1.632653061)(x + -1.632653061) = 4.298209079

Calculate the square root of the right side: 2.073212261

Break this problem into two subproblems by setting 
(x + -1.632653061) equal to 2.073212261 and -2.073212261.

Subproblem 1

x + -1.632653061 = 2.073212261 Simplifying x + -1.632653061 = 2.073212261 Reorder the terms: -1.632653061 + x = 2.073212261 Solving -1.632653061 + x = 2.073212261 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.632653061' to each side of the equation. -1.632653061 + 1.632653061 + x = 2.073212261 + 1.632653061 Combine like terms: -1.632653061 + 1.632653061 = 0.000000000 0.000000000 + x = 2.073212261 + 1.632653061 x = 2.073212261 + 1.632653061 Combine like terms: 2.073212261 + 1.632653061 = 3.705865322 x = 3.705865322 Simplifying x = 3.705865322

Subproblem 2

x + -1.632653061 = -2.073212261 Simplifying x + -1.632653061 = -2.073212261 Reorder the terms: -1.632653061 + x = -2.073212261 Solving -1.632653061 + x = -2.073212261 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.632653061' to each side of the equation. -1.632653061 + 1.632653061 + x = -2.073212261 + 1.632653061 Combine like terms: -1.632653061 + 1.632653061 = 0.000000000 0.000000000 + x = -2.073212261 + 1.632653061 x = -2.073212261 + 1.632653061 Combine like terms: -2.073212261 + 1.632653061 = -0.4405592 x = -0.4405592 Simplifying x = -0.4405592

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.705865322, -0.4405592}

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