9p^2-8p-9=0

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Solution for 9p^2-8p-9=0 equation:


Simplifying
9p2 + -8p + -9 = 0

Reorder the terms:
-9 + -8p + 9p2 = 0

Solving
-9 + -8p + 9p2 = 0

Solving for variable 'p'.

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

Divide each side by '9'.
-1 + -0.8888888889p + p2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -0.8888888889p + 1 + p2 = 0 + 1

Reorder the terms:
-1 + 1 + -0.8888888889p + p2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -0.8888888889p + p2 = 0 + 1
-0.8888888889p + p2 = 0 + 1

Combine like terms: 0 + 1 = 1
-0.8888888889p + p2 = 1

The p term is -0.8888888889p.  Take half its coefficient (-0.4444444445).
Square it (0.1975308642) and add it to both sides.

Add '0.1975308642' to each side of the equation.
-0.8888888889p + 0.1975308642 + p2 = 1 + 0.1975308642

Reorder the terms:
0.1975308642 + -0.8888888889p + p2 = 1 + 0.1975308642

Combine like terms: 1 + 0.1975308642 = 1.1975308642
0.1975308642 + -0.8888888889p + p2 = 1.1975308642

Factor a perfect square on the left side:
(p + -0.4444444445)(p + -0.4444444445) = 1.1975308642

Calculate the square root of the right side: 1.094317534

Break this problem into two subproblems by setting 
(p + -0.4444444445) equal to 1.094317534 and -1.094317534.

Subproblem 1

p + -0.4444444445 = 1.094317534 Simplifying p + -0.4444444445 = 1.094317534 Reorder the terms: -0.4444444445 + p = 1.094317534 Solving -0.4444444445 + p = 1.094317534 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '0.4444444445' to each side of the equation. -0.4444444445 + 0.4444444445 + p = 1.094317534 + 0.4444444445 Combine like terms: -0.4444444445 + 0.4444444445 = 0.0000000000 0.0000000000 + p = 1.094317534 + 0.4444444445 p = 1.094317534 + 0.4444444445 Combine like terms: 1.094317534 + 0.4444444445 = 1.5387619785 p = 1.5387619785 Simplifying p = 1.5387619785

Subproblem 2

p + -0.4444444445 = -1.094317534 Simplifying p + -0.4444444445 = -1.094317534 Reorder the terms: -0.4444444445 + p = -1.094317534 Solving -0.4444444445 + p = -1.094317534 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '0.4444444445' to each side of the equation. -0.4444444445 + 0.4444444445 + p = -1.094317534 + 0.4444444445 Combine like terms: -0.4444444445 + 0.4444444445 = 0.0000000000 0.0000000000 + p = -1.094317534 + 0.4444444445 p = -1.094317534 + 0.4444444445 Combine like terms: -1.094317534 + 0.4444444445 = -0.6498730895 p = -0.6498730895 Simplifying p = -0.6498730895

Solution

The solution to the problem is based on the solutions from the subproblems. p = {1.5387619785, -0.6498730895}

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