22=6*(x*x)-5x-21

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Solution for 22=6*(x*x)-5x-21 equation:


Simplifying
22 = 6(x * x) + -5x + -21

Multiply x * x
22 = 6(x2) + -5x + -21

Reorder the terms:
22 = -21 + -5x + 6x2

Solving
22 = -21 + -5x + 6x2

Solving for variable 'x'.

Combine like terms: 22 + 21 = 43
43 + 5x + -6x2 = -21 + -5x + 6x2 + 21 + 5x + -6x2

Reorder the terms:
43 + 5x + -6x2 = -21 + 21 + -5x + 5x + 6x2 + -6x2

Combine like terms: -21 + 21 = 0
43 + 5x + -6x2 = 0 + -5x + 5x + 6x2 + -6x2
43 + 5x + -6x2 = -5x + 5x + 6x2 + -6x2

Combine like terms: -5x + 5x = 0
43 + 5x + -6x2 = 0 + 6x2 + -6x2
43 + 5x + -6x2 = 6x2 + -6x2

Combine like terms: 6x2 + -6x2 = 0
43 + 5x + -6x2 = 0

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

Divide each side by '-6'.
-7.166666667 + -0.8333333333x + x2 = 0

Move the constant term to the right:

Add '7.166666667' to each side of the equation.
-7.166666667 + -0.8333333333x + 7.166666667 + x2 = 0 + 7.166666667

Reorder the terms:
-7.166666667 + 7.166666667 + -0.8333333333x + x2 = 0 + 7.166666667

Combine like terms: -7.166666667 + 7.166666667 = 0.000000000
0.000000000 + -0.8333333333x + x2 = 0 + 7.166666667
-0.8333333333x + x2 = 0 + 7.166666667

Combine like terms: 0 + 7.166666667 = 7.166666667
-0.8333333333x + x2 = 7.166666667

The x term is -0.8333333333x.  Take half its coefficient (-0.4166666667).
Square it (0.1736111111) and add it to both sides.

Add '0.1736111111' to each side of the equation.
-0.8333333333x + 0.1736111111 + x2 = 7.166666667 + 0.1736111111

Reorder the terms:
0.1736111111 + -0.8333333333x + x2 = 7.166666667 + 0.1736111111

Combine like terms: 7.166666667 + 0.1736111111 = 7.3402777781
0.1736111111 + -0.8333333333x + x2 = 7.3402777781

Factor a perfect square on the left side:
(x + -0.4166666667)(x + -0.4166666667) = 7.3402777781

Calculate the square root of the right side: 2.709294701

Break this problem into two subproblems by setting 
(x + -0.4166666667) equal to 2.709294701 and -2.709294701.

Subproblem 1

x + -0.4166666667 = 2.709294701 Simplifying x + -0.4166666667 = 2.709294701 Reorder the terms: -0.4166666667 + x = 2.709294701 Solving -0.4166666667 + x = 2.709294701 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4166666667' to each side of the equation. -0.4166666667 + 0.4166666667 + x = 2.709294701 + 0.4166666667 Combine like terms: -0.4166666667 + 0.4166666667 = 0.0000000000 0.0000000000 + x = 2.709294701 + 0.4166666667 x = 2.709294701 + 0.4166666667 Combine like terms: 2.709294701 + 0.4166666667 = 3.1259613677 x = 3.1259613677 Simplifying x = 3.1259613677

Subproblem 2

x + -0.4166666667 = -2.709294701 Simplifying x + -0.4166666667 = -2.709294701 Reorder the terms: -0.4166666667 + x = -2.709294701 Solving -0.4166666667 + x = -2.709294701 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4166666667' to each side of the equation. -0.4166666667 + 0.4166666667 + x = -2.709294701 + 0.4166666667 Combine like terms: -0.4166666667 + 0.4166666667 = 0.0000000000 0.0000000000 + x = -2.709294701 + 0.4166666667 x = -2.709294701 + 0.4166666667 Combine like terms: -2.709294701 + 0.4166666667 = -2.2926280343 x = -2.2926280343 Simplifying x = -2.2926280343

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.1259613677, -2.2926280343}

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