18p^2-22p-21=

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Solution for 18p^2-22p-21= equation:


Simplifying
18p2 + -22p + -21 = 0

Reorder the terms:
-21 + -22p + 18p2 = 0

Solving
-21 + -22p + 18p2 = 0

Solving for variable 'p'.

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

Divide each side by '18'.
-1.166666667 + -1.222222222p + p2 = 0

Move the constant term to the right:

Add '1.166666667' to each side of the equation.
-1.166666667 + -1.222222222p + 1.166666667 + p2 = 0 + 1.166666667

Reorder the terms:
-1.166666667 + 1.166666667 + -1.222222222p + p2 = 0 + 1.166666667

Combine like terms: -1.166666667 + 1.166666667 = 0.000000000
0.000000000 + -1.222222222p + p2 = 0 + 1.166666667
-1.222222222p + p2 = 0 + 1.166666667

Combine like terms: 0 + 1.166666667 = 1.166666667
-1.222222222p + p2 = 1.166666667

The p term is -1.222222222p.  Take half its coefficient (-0.611111111).
Square it (0.3734567900) and add it to both sides.

Add '0.3734567900' to each side of the equation.
-1.222222222p + 0.3734567900 + p2 = 1.166666667 + 0.3734567900

Reorder the terms:
0.3734567900 + -1.222222222p + p2 = 1.166666667 + 0.3734567900

Combine like terms: 1.166666667 + 0.3734567900 = 1.540123457
0.3734567900 + -1.222222222p + p2 = 1.540123457

Factor a perfect square on the left side:
(p + -0.611111111)(p + -0.611111111) = 1.540123457

Calculate the square root of the right side: 1.241017106

Break this problem into two subproblems by setting 
(p + -0.611111111) equal to 1.241017106 and -1.241017106.

Subproblem 1

p + -0.611111111 = 1.241017106 Simplifying p + -0.611111111 = 1.241017106 Reorder the terms: -0.611111111 + p = 1.241017106 Solving -0.611111111 + p = 1.241017106 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '0.611111111' to each side of the equation. -0.611111111 + 0.611111111 + p = 1.241017106 + 0.611111111 Combine like terms: -0.611111111 + 0.611111111 = 0.000000000 0.000000000 + p = 1.241017106 + 0.611111111 p = 1.241017106 + 0.611111111 Combine like terms: 1.241017106 + 0.611111111 = 1.852128217 p = 1.852128217 Simplifying p = 1.852128217

Subproblem 2

p + -0.611111111 = -1.241017106 Simplifying p + -0.611111111 = -1.241017106 Reorder the terms: -0.611111111 + p = -1.241017106 Solving -0.611111111 + p = -1.241017106 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '0.611111111' to each side of the equation. -0.611111111 + 0.611111111 + p = -1.241017106 + 0.611111111 Combine like terms: -0.611111111 + 0.611111111 = 0.000000000 0.000000000 + p = -1.241017106 + 0.611111111 p = -1.241017106 + 0.611111111 Combine like terms: -1.241017106 + 0.611111111 = -0.629905995 p = -0.629905995 Simplifying p = -0.629905995

Solution

The solution to the problem is based on the solutions from the subproblems. p = {1.852128217, -0.629905995}

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