6x^2+23x-21=0

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Solution for 6x^2+23x-21=0 equation:


Simplifying
6x2 + 23x + -21 = 0

Reorder the terms:
-21 + 23x + 6x2 = 0

Solving
-21 + 23x + 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'.
-3.5 + 3.833333333x + x2 = 0

Move the constant term to the right:

Add '3.5' to each side of the equation.
-3.5 + 3.833333333x + 3.5 + x2 = 0 + 3.5

Reorder the terms:
-3.5 + 3.5 + 3.833333333x + x2 = 0 + 3.5

Combine like terms: -3.5 + 3.5 = 0.0
0.0 + 3.833333333x + x2 = 0 + 3.5
3.833333333x + x2 = 0 + 3.5

Combine like terms: 0 + 3.5 = 3.5
3.833333333x + x2 = 3.5

The x term is 3.833333333x.  Take half its coefficient (1.916666667).
Square it (3.673611112) and add it to both sides.

Add '3.673611112' to each side of the equation.
3.833333333x + 3.673611112 + x2 = 3.5 + 3.673611112

Reorder the terms:
3.673611112 + 3.833333333x + x2 = 3.5 + 3.673611112

Combine like terms: 3.5 + 3.673611112 = 7.173611112
3.673611112 + 3.833333333x + x2 = 7.173611112

Factor a perfect square on the left side:
(x + 1.916666667)(x + 1.916666667) = 7.173611112

Calculate the square root of the right side: 2.67835978

Break this problem into two subproblems by setting 
(x + 1.916666667) equal to 2.67835978 and -2.67835978.

Subproblem 1

x + 1.916666667 = 2.67835978 Simplifying x + 1.916666667 = 2.67835978 Reorder the terms: 1.916666667 + x = 2.67835978 Solving 1.916666667 + x = 2.67835978 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.916666667' to each side of the equation. 1.916666667 + -1.916666667 + x = 2.67835978 + -1.916666667 Combine like terms: 1.916666667 + -1.916666667 = 0.000000000 0.000000000 + x = 2.67835978 + -1.916666667 x = 2.67835978 + -1.916666667 Combine like terms: 2.67835978 + -1.916666667 = 0.761693113 x = 0.761693113 Simplifying x = 0.761693113

Subproblem 2

x + 1.916666667 = -2.67835978 Simplifying x + 1.916666667 = -2.67835978 Reorder the terms: 1.916666667 + x = -2.67835978 Solving 1.916666667 + x = -2.67835978 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.916666667' to each side of the equation. 1.916666667 + -1.916666667 + x = -2.67835978 + -1.916666667 Combine like terms: 1.916666667 + -1.916666667 = 0.000000000 0.000000000 + x = -2.67835978 + -1.916666667 x = -2.67835978 + -1.916666667 Combine like terms: -2.67835978 + -1.916666667 = -4.595026447 x = -4.595026447 Simplifying x = -4.595026447

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.761693113, -4.595026447}

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