2+9p-2p^2=4

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Solution for 2+9p-2p^2=4 equation:


Simplifying
2 + 9p + -2p2 = 4

Solving
2 + 9p + -2p2 = 4

Solving for variable 'p'.

Reorder the terms:
2 + -4 + 9p + -2p2 = 4 + -4

Combine like terms: 2 + -4 = -2
-2 + 9p + -2p2 = 4 + -4

Combine like terms: 4 + -4 = 0
-2 + 9p + -2p2 = 0

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
1 + -4.5p + p2 = 0

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + -4.5p + -1 + p2 = 0 + -1

Reorder the terms:
1 + -1 + -4.5p + p2 = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -4.5p + p2 = 0 + -1
-4.5p + p2 = 0 + -1

Combine like terms: 0 + -1 = -1
-4.5p + p2 = -1

The p term is -4.5p.  Take half its coefficient (-2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
-4.5p + 5.0625 + p2 = -1 + 5.0625

Reorder the terms:
5.0625 + -4.5p + p2 = -1 + 5.0625

Combine like terms: -1 + 5.0625 = 4.0625
5.0625 + -4.5p + p2 = 4.0625

Factor a perfect square on the left side:
(p + -2.25)(p + -2.25) = 4.0625

Calculate the square root of the right side: 2.015564437

Break this problem into two subproblems by setting 
(p + -2.25) equal to 2.015564437 and -2.015564437.

Subproblem 1

p + -2.25 = 2.015564437 Simplifying p + -2.25 = 2.015564437 Reorder the terms: -2.25 + p = 2.015564437 Solving -2.25 + p = 2.015564437 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + p = 2.015564437 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + p = 2.015564437 + 2.25 p = 2.015564437 + 2.25 Combine like terms: 2.015564437 + 2.25 = 4.265564437 p = 4.265564437 Simplifying p = 4.265564437

Subproblem 2

p + -2.25 = -2.015564437 Simplifying p + -2.25 = -2.015564437 Reorder the terms: -2.25 + p = -2.015564437 Solving -2.25 + p = -2.015564437 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + p = -2.015564437 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + p = -2.015564437 + 2.25 p = -2.015564437 + 2.25 Combine like terms: -2.015564437 + 2.25 = 0.234435563 p = 0.234435563 Simplifying p = 0.234435563

Solution

The solution to the problem is based on the solutions from the subproblems. p = {4.265564437, 0.234435563}

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