3x^2+5x+20=100x-2

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Solution for 3x^2+5x+20=100x-2 equation:


Simplifying
3x2 + 5x + 20 = 100x + -2

Reorder the terms:
20 + 5x + 3x2 = 100x + -2

Reorder the terms:
20 + 5x + 3x2 = -2 + 100x

Solving
20 + 5x + 3x2 = -2 + 100x

Solving for variable 'x'.

Reorder the terms:
20 + 2 + 5x + -100x + 3x2 = -2 + 100x + 2 + -100x

Combine like terms: 20 + 2 = 22
22 + 5x + -100x + 3x2 = -2 + 100x + 2 + -100x

Combine like terms: 5x + -100x = -95x
22 + -95x + 3x2 = -2 + 100x + 2 + -100x

Reorder the terms:
22 + -95x + 3x2 = -2 + 2 + 100x + -100x

Combine like terms: -2 + 2 = 0
22 + -95x + 3x2 = 0 + 100x + -100x
22 + -95x + 3x2 = 100x + -100x

Combine like terms: 100x + -100x = 0
22 + -95x + 3x2 = 0

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

Divide each side by '3'.
7.333333333 + -31.66666667x + x2 = 0

Move the constant term to the right:

Add '-7.333333333' to each side of the equation.
7.333333333 + -31.66666667x + -7.333333333 + x2 = 0 + -7.333333333

Reorder the terms:
7.333333333 + -7.333333333 + -31.66666667x + x2 = 0 + -7.333333333

Combine like terms: 7.333333333 + -7.333333333 = 0.000000000
0.000000000 + -31.66666667x + x2 = 0 + -7.333333333
-31.66666667x + x2 = 0 + -7.333333333

Combine like terms: 0 + -7.333333333 = -7.333333333
-31.66666667x + x2 = -7.333333333

The x term is -31.66666667x.  Take half its coefficient (-15.83333334).
Square it (250.6944447) and add it to both sides.

Add '250.6944447' to each side of the equation.
-31.66666667x + 250.6944447 + x2 = -7.333333333 + 250.6944447

Reorder the terms:
250.6944447 + -31.66666667x + x2 = -7.333333333 + 250.6944447

Combine like terms: -7.333333333 + 250.6944447 = 243.361111367
250.6944447 + -31.66666667x + x2 = 243.361111367

Factor a perfect square on the left side:
(x + -15.83333334)(x + -15.83333334) = 243.361111367

Calculate the square root of the right side: 15.600035621

Break this problem into two subproblems by setting 
(x + -15.83333334) equal to 15.600035621 and -15.600035621.

Subproblem 1

x + -15.83333334 = 15.600035621 Simplifying x + -15.83333334 = 15.600035621 Reorder the terms: -15.83333334 + x = 15.600035621 Solving -15.83333334 + x = 15.600035621 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15.83333334' to each side of the equation. -15.83333334 + 15.83333334 + x = 15.600035621 + 15.83333334 Combine like terms: -15.83333334 + 15.83333334 = 0.00000000 0.00000000 + x = 15.600035621 + 15.83333334 x = 15.600035621 + 15.83333334 Combine like terms: 15.600035621 + 15.83333334 = 31.433368961 x = 31.433368961 Simplifying x = 31.433368961

Subproblem 2

x + -15.83333334 = -15.600035621 Simplifying x + -15.83333334 = -15.600035621 Reorder the terms: -15.83333334 + x = -15.600035621 Solving -15.83333334 + x = -15.600035621 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15.83333334' to each side of the equation. -15.83333334 + 15.83333334 + x = -15.600035621 + 15.83333334 Combine like terms: -15.83333334 + 15.83333334 = 0.00000000 0.00000000 + x = -15.600035621 + 15.83333334 x = -15.600035621 + 15.83333334 Combine like terms: -15.600035621 + 15.83333334 = 0.233297719 x = 0.233297719 Simplifying x = 0.233297719

Solution

The solution to the problem is based on the solutions from the subproblems. x = {31.433368961, 0.233297719}

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