6x^2+21x-200=0

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Solution for 6x^2+21x-200=0 equation:


Simplifying
6x2 + 21x + -200 = 0

Reorder the terms:
-200 + 21x + 6x2 = 0

Solving
-200 + 21x + 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'.
-33.33333333 + 3.5x + x2 = 0

Move the constant term to the right:

Add '33.33333333' to each side of the equation.
-33.33333333 + 3.5x + 33.33333333 + x2 = 0 + 33.33333333

Reorder the terms:
-33.33333333 + 33.33333333 + 3.5x + x2 = 0 + 33.33333333

Combine like terms: -33.33333333 + 33.33333333 = 0.00000000
0.00000000 + 3.5x + x2 = 0 + 33.33333333
3.5x + x2 = 0 + 33.33333333

Combine like terms: 0 + 33.33333333 = 33.33333333
3.5x + x2 = 33.33333333

The x term is 3.5x.  Take half its coefficient (1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
3.5x + 3.0625 + x2 = 33.33333333 + 3.0625

Reorder the terms:
3.0625 + 3.5x + x2 = 33.33333333 + 3.0625

Combine like terms: 33.33333333 + 3.0625 = 36.39583333
3.0625 + 3.5x + x2 = 36.39583333

Factor a perfect square on the left side:
(x + 1.75)(x + 1.75) = 36.39583333

Calculate the square root of the right side: 6.032895932

Break this problem into two subproblems by setting 
(x + 1.75) equal to 6.032895932 and -6.032895932.

Subproblem 1

x + 1.75 = 6.032895932 Simplifying x + 1.75 = 6.032895932 Reorder the terms: 1.75 + x = 6.032895932 Solving 1.75 + x = 6.032895932 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + x = 6.032895932 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = 6.032895932 + -1.75 x = 6.032895932 + -1.75 Combine like terms: 6.032895932 + -1.75 = 4.282895932 x = 4.282895932 Simplifying x = 4.282895932

Subproblem 2

x + 1.75 = -6.032895932 Simplifying x + 1.75 = -6.032895932 Reorder the terms: 1.75 + x = -6.032895932 Solving 1.75 + x = -6.032895932 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + x = -6.032895932 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = -6.032895932 + -1.75 x = -6.032895932 + -1.75 Combine like terms: -6.032895932 + -1.75 = -7.782895932 x = -7.782895932 Simplifying x = -7.782895932

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.282895932, -7.782895932}

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