6x^2+21x-10=0

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Solution for 6x^2+21x-10=0 equation:


Simplifying
6x2 + 21x + -10 = 0

Reorder the terms:
-10 + 21x + 6x2 = 0

Solving
-10 + 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'.
-1.666666667 + 3.5x + x2 = 0

Move the constant term to the right:

Add '1.666666667' to each side of the equation.
-1.666666667 + 3.5x + 1.666666667 + x2 = 0 + 1.666666667

Reorder the terms:
-1.666666667 + 1.666666667 + 3.5x + x2 = 0 + 1.666666667

Combine like terms: -1.666666667 + 1.666666667 = 0.000000000
0.000000000 + 3.5x + x2 = 0 + 1.666666667
3.5x + x2 = 0 + 1.666666667

Combine like terms: 0 + 1.666666667 = 1.666666667
3.5x + x2 = 1.666666667

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 = 1.666666667 + 3.0625

Reorder the terms:
3.0625 + 3.5x + x2 = 1.666666667 + 3.0625

Combine like terms: 1.666666667 + 3.0625 = 4.729166667
3.0625 + 3.5x + x2 = 4.729166667

Factor a perfect square on the left side:
(x + 1.75)(x + 1.75) = 4.729166667

Calculate the square root of the right side: 2.174664725

Break this problem into two subproblems by setting 
(x + 1.75) equal to 2.174664725 and -2.174664725.

Subproblem 1

x + 1.75 = 2.174664725 Simplifying x + 1.75 = 2.174664725 Reorder the terms: 1.75 + x = 2.174664725 Solving 1.75 + x = 2.174664725 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 = 2.174664725 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = 2.174664725 + -1.75 x = 2.174664725 + -1.75 Combine like terms: 2.174664725 + -1.75 = 0.424664725 x = 0.424664725 Simplifying x = 0.424664725

Subproblem 2

x + 1.75 = -2.174664725 Simplifying x + 1.75 = -2.174664725 Reorder the terms: 1.75 + x = -2.174664725 Solving 1.75 + x = -2.174664725 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 = -2.174664725 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = -2.174664725 + -1.75 x = -2.174664725 + -1.75 Combine like terms: -2.174664725 + -1.75 = -3.924664725 x = -3.924664725 Simplifying x = -3.924664725

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.424664725, -3.924664725}

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