6x^2+3x-100=0

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Solution for 6x^2+3x-100=0 equation:


Simplifying
6x2 + 3x + -100 = 0

Reorder the terms:
-100 + 3x + 6x2 = 0

Solving
-100 + 3x + 6x2 = 0

Solving for variable 'x'.

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

Divide each side by '6'.
-16.66666667 + 0.5x + x2 = 0

Move the constant term to the right:

Add '16.66666667' to each side of the equation.
-16.66666667 + 0.5x + 16.66666667 + x2 = 0 + 16.66666667

Reorder the terms:
-16.66666667 + 16.66666667 + 0.5x + x2 = 0 + 16.66666667

Combine like terms: -16.66666667 + 16.66666667 = 0.00000000
0.00000000 + 0.5x + x2 = 0 + 16.66666667
0.5x + x2 = 0 + 16.66666667

Combine like terms: 0 + 16.66666667 = 16.66666667
0.5x + x2 = 16.66666667

The x term is 0.5x.  Take half its coefficient (0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
0.5x + 0.0625 + x2 = 16.66666667 + 0.0625

Reorder the terms:
0.0625 + 0.5x + x2 = 16.66666667 + 0.0625

Combine like terms: 16.66666667 + 0.0625 = 16.72916667
0.0625 + 0.5x + x2 = 16.72916667

Factor a perfect square on the left side:
(x + 0.25)(x + 0.25) = 16.72916667

Calculate the square root of the right side: 4.090130398

Break this problem into two subproblems by setting 
(x + 0.25) equal to 4.090130398 and -4.090130398.

Subproblem 1

x + 0.25 = 4.090130398 Simplifying x + 0.25 = 4.090130398 Reorder the terms: 0.25 + x = 4.090130398 Solving 0.25 + x = 4.090130398 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = 4.090130398 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = 4.090130398 + -0.25 x = 4.090130398 + -0.25 Combine like terms: 4.090130398 + -0.25 = 3.840130398 x = 3.840130398 Simplifying x = 3.840130398

Subproblem 2

x + 0.25 = -4.090130398 Simplifying x + 0.25 = -4.090130398 Reorder the terms: 0.25 + x = -4.090130398 Solving 0.25 + x = -4.090130398 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = -4.090130398 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = -4.090130398 + -0.25 x = -4.090130398 + -0.25 Combine like terms: -4.090130398 + -0.25 = -4.340130398 x = -4.340130398 Simplifying x = -4.340130398

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.840130398, -4.340130398}

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