144=(-p)(p-90)

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Solution for 144=(-p)(p-90) equation:


Simplifying
144 = (-1p)(p + -90)

Remove parenthesis around (-1p)
144 = -1p(p + -90)

Reorder the terms:
144 = -1p(-90 + p)
144 = (-90 * -1p + p * -1p)
144 = (90p + -1p2)

Solving
144 = 90p + -1p2

Solving for variable 'p'.

Reorder the terms:
144 + -90p + p2 = 90p + -90p + -1p2 + p2

Combine like terms: 90p + -90p = 0
144 + -90p + p2 = 0 + -1p2 + p2
144 + -90p + p2 = -1p2 + p2

Combine like terms: -1p2 + p2 = 0
144 + -90p + p2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-144' to each side of the equation.
144 + -90p + -144 + p2 = 0 + -144

Reorder the terms:
144 + -144 + -90p + p2 = 0 + -144

Combine like terms: 144 + -144 = 0
0 + -90p + p2 = 0 + -144
-90p + p2 = 0 + -144

Combine like terms: 0 + -144 = -144
-90p + p2 = -144

The p term is -90p.  Take half its coefficient (-45).
Square it (2025) and add it to both sides.

Add '2025' to each side of the equation.
-90p + 2025 + p2 = -144 + 2025

Reorder the terms:
2025 + -90p + p2 = -144 + 2025

Combine like terms: -144 + 2025 = 1881
2025 + -90p + p2 = 1881

Factor a perfect square on the left side:
(p + -45)(p + -45) = 1881

Calculate the square root of the right side: 43.370496884

Break this problem into two subproblems by setting 
(p + -45) equal to 43.370496884 and -43.370496884.

Subproblem 1

p + -45 = 43.370496884 Simplifying p + -45 = 43.370496884 Reorder the terms: -45 + p = 43.370496884 Solving -45 + p = 43.370496884 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '45' to each side of the equation. -45 + 45 + p = 43.370496884 + 45 Combine like terms: -45 + 45 = 0 0 + p = 43.370496884 + 45 p = 43.370496884 + 45 Combine like terms: 43.370496884 + 45 = 88.370496884 p = 88.370496884 Simplifying p = 88.370496884

Subproblem 2

p + -45 = -43.370496884 Simplifying p + -45 = -43.370496884 Reorder the terms: -45 + p = -43.370496884 Solving -45 + p = -43.370496884 Solving for variable 'p'. Move all terms containing p to the left, all other terms to the right. Add '45' to each side of the equation. -45 + 45 + p = -43.370496884 + 45 Combine like terms: -45 + 45 = 0 0 + p = -43.370496884 + 45 p = -43.370496884 + 45 Combine like terms: -43.370496884 + 45 = 1.629503116 p = 1.629503116 Simplifying p = 1.629503116

Solution

The solution to the problem is based on the solutions from the subproblems. p = {88.370496884, 1.629503116}

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