99x^2-2x-16=0

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Solution for 99x^2-2x-16=0 equation:


Simplifying
99x2 + -2x + -16 = 0

Reorder the terms:
-16 + -2x + 99x2 = 0

Solving
-16 + -2x + 99x2 = 0

Solving for variable 'x'.

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

Divide each side by '99'.
-0.1616161616 + -0.0202020202x + x2 = 0

Move the constant term to the right:

Add '0.1616161616' to each side of the equation.
-0.1616161616 + -0.0202020202x + 0.1616161616 + x2 = 0 + 0.1616161616

Reorder the terms:
-0.1616161616 + 0.1616161616 + -0.0202020202x + x2 = 0 + 0.1616161616

Combine like terms: -0.1616161616 + 0.1616161616 = 0.0000000000
0.0000000000 + -0.0202020202x + x2 = 0 + 0.1616161616
-0.0202020202x + x2 = 0 + 0.1616161616

Combine like terms: 0 + 0.1616161616 = 0.1616161616
-0.0202020202x + x2 = 0.1616161616

The x term is -0.0202020202x.  Take half its coefficient (-0.0101010101).
Square it (0.0001020304050) and add it to both sides.

Add '0.0001020304050' to each side of the equation.
-0.0202020202x + 0.0001020304050 + x2 = 0.1616161616 + 0.0001020304050

Reorder the terms:
0.0001020304050 + -0.0202020202x + x2 = 0.1616161616 + 0.0001020304050

Combine like terms: 0.1616161616 + 0.0001020304050 = 0.161718192005
0.0001020304050 + -0.0202020202x + x2 = 0.161718192005

Factor a perfect square on the left side:
(x + -0.0101010101)(x + -0.0101010101) = 0.161718192005

Calculate the square root of the right side: 0.402142005

Break this problem into two subproblems by setting 
(x + -0.0101010101) equal to 0.402142005 and -0.402142005.

Subproblem 1

x + -0.0101010101 = 0.402142005 Simplifying x + -0.0101010101 = 0.402142005 Reorder the terms: -0.0101010101 + x = 0.402142005 Solving -0.0101010101 + x = 0.402142005 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.0101010101' to each side of the equation. -0.0101010101 + 0.0101010101 + x = 0.402142005 + 0.0101010101 Combine like terms: -0.0101010101 + 0.0101010101 = 0.0000000000 0.0000000000 + x = 0.402142005 + 0.0101010101 x = 0.402142005 + 0.0101010101 Combine like terms: 0.402142005 + 0.0101010101 = 0.4122430151 x = 0.4122430151 Simplifying x = 0.4122430151

Subproblem 2

x + -0.0101010101 = -0.402142005 Simplifying x + -0.0101010101 = -0.402142005 Reorder the terms: -0.0101010101 + x = -0.402142005 Solving -0.0101010101 + x = -0.402142005 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.0101010101' to each side of the equation. -0.0101010101 + 0.0101010101 + x = -0.402142005 + 0.0101010101 Combine like terms: -0.0101010101 + 0.0101010101 = 0.0000000000 0.0000000000 + x = -0.402142005 + 0.0101010101 x = -0.402142005 + 0.0101010101 Combine like terms: -0.402142005 + 0.0101010101 = -0.3920409949 x = -0.3920409949 Simplifying x = -0.3920409949

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.4122430151, -0.3920409949}

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