99x^2+20x-200=0

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Solution for 99x^2+20x-200=0 equation:


Simplifying
99x2 + 20x + -200 = 0

Reorder the terms:
-200 + 20x + 99x2 = 0

Solving
-200 + 20x + 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'.
-2.02020202 + 0.202020202x + x2 = 0

Move the constant term to the right:

Add '2.02020202' to each side of the equation.
-2.02020202 + 0.202020202x + 2.02020202 + x2 = 0 + 2.02020202

Reorder the terms:
-2.02020202 + 2.02020202 + 0.202020202x + x2 = 0 + 2.02020202

Combine like terms: -2.02020202 + 2.02020202 = 0.00000000
0.00000000 + 0.202020202x + x2 = 0 + 2.02020202
0.202020202x + x2 = 0 + 2.02020202

Combine like terms: 0 + 2.02020202 = 2.02020202
0.202020202x + x2 = 2.02020202

The x term is 0.202020202x.  Take half its coefficient (0.101010101).
Square it (0.01020304050) and add it to both sides.

Add '0.01020304050' to each side of the equation.
0.202020202x + 0.01020304050 + x2 = 2.02020202 + 0.01020304050

Reorder the terms:
0.01020304050 + 0.202020202x + x2 = 2.02020202 + 0.01020304050

Combine like terms: 2.02020202 + 0.01020304050 = 2.0304050605
0.01020304050 + 0.202020202x + x2 = 2.0304050605

Factor a perfect square on the left side:
(x + 0.101010101)(x + 0.101010101) = 2.0304050605

Calculate the square root of the right side: 1.424922826

Break this problem into two subproblems by setting 
(x + 0.101010101) equal to 1.424922826 and -1.424922826.

Subproblem 1

x + 0.101010101 = 1.424922826 Simplifying x + 0.101010101 = 1.424922826 Reorder the terms: 0.101010101 + x = 1.424922826 Solving 0.101010101 + x = 1.424922826 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.101010101' to each side of the equation. 0.101010101 + -0.101010101 + x = 1.424922826 + -0.101010101 Combine like terms: 0.101010101 + -0.101010101 = 0.000000000 0.000000000 + x = 1.424922826 + -0.101010101 x = 1.424922826 + -0.101010101 Combine like terms: 1.424922826 + -0.101010101 = 1.323912725 x = 1.323912725 Simplifying x = 1.323912725

Subproblem 2

x + 0.101010101 = -1.424922826 Simplifying x + 0.101010101 = -1.424922826 Reorder the terms: 0.101010101 + x = -1.424922826 Solving 0.101010101 + x = -1.424922826 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.101010101' to each side of the equation. 0.101010101 + -0.101010101 + x = -1.424922826 + -0.101010101 Combine like terms: 0.101010101 + -0.101010101 = 0.000000000 0.000000000 + x = -1.424922826 + -0.101010101 x = -1.424922826 + -0.101010101 Combine like terms: -1.424922826 + -0.101010101 = -1.525932927 x = -1.525932927 Simplifying x = -1.525932927

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.323912725, -1.525932927}

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