4.9x^2-2.6x-8.8=0

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Solution for 4.9x^2-2.6x-8.8=0 equation:


Simplifying
4.9x2 + -2.6x + -8.8 = 0

Reorder the terms:
-8.8 + -2.6x + 4.9x2 = 0

Solving
-8.8 + -2.6x + 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'.
-1.795918367 + -0.5306122449x + x2 = 0

Move the constant term to the right:

Add '1.795918367' to each side of the equation.
-1.795918367 + -0.5306122449x + 1.795918367 + x2 = 0 + 1.795918367

Reorder the terms:
-1.795918367 + 1.795918367 + -0.5306122449x + x2 = 0 + 1.795918367

Combine like terms: -1.795918367 + 1.795918367 = 0.000000000
0.000000000 + -0.5306122449x + x2 = 0 + 1.795918367
-0.5306122449x + x2 = 0 + 1.795918367

Combine like terms: 0 + 1.795918367 = 1.795918367
-0.5306122449x + x2 = 1.795918367

The x term is -0.5306122449x.  Take half its coefficient (-0.2653061225).
Square it (0.07038733864) and add it to both sides.

Add '0.07038733864' to each side of the equation.
-0.5306122449x + 0.07038733864 + x2 = 1.795918367 + 0.07038733864

Reorder the terms:
0.07038733864 + -0.5306122449x + x2 = 1.795918367 + 0.07038733864

Combine like terms: 1.795918367 + 0.07038733864 = 1.86630570564
0.07038733864 + -0.5306122449x + x2 = 1.86630570564

Factor a perfect square on the left side:
(x + -0.2653061225)(x + -0.2653061225) = 1.86630570564

Calculate the square root of the right side: 1.366127998

Break this problem into two subproblems by setting 
(x + -0.2653061225) equal to 1.366127998 and -1.366127998.

Subproblem 1

x + -0.2653061225 = 1.366127998 Simplifying x + -0.2653061225 = 1.366127998 Reorder the terms: -0.2653061225 + x = 1.366127998 Solving -0.2653061225 + x = 1.366127998 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2653061225' to each side of the equation. -0.2653061225 + 0.2653061225 + x = 1.366127998 + 0.2653061225 Combine like terms: -0.2653061225 + 0.2653061225 = 0.0000000000 0.0000000000 + x = 1.366127998 + 0.2653061225 x = 1.366127998 + 0.2653061225 Combine like terms: 1.366127998 + 0.2653061225 = 1.6314341205 x = 1.6314341205 Simplifying x = 1.6314341205

Subproblem 2

x + -0.2653061225 = -1.366127998 Simplifying x + -0.2653061225 = -1.366127998 Reorder the terms: -0.2653061225 + x = -1.366127998 Solving -0.2653061225 + x = -1.366127998 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2653061225' to each side of the equation. -0.2653061225 + 0.2653061225 + x = -1.366127998 + 0.2653061225 Combine like terms: -0.2653061225 + 0.2653061225 = 0.0000000000 0.0000000000 + x = -1.366127998 + 0.2653061225 x = -1.366127998 + 0.2653061225 Combine like terms: -1.366127998 + 0.2653061225 = -1.1008218755 x = -1.1008218755 Simplifying x = -1.1008218755

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.6314341205, -1.1008218755}

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