p(p+1)=90

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Solution for p(p+1)=90 equation:


Simplifying
p(p + 1) = 90

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

Solving
1p + p2 = 90

Solving for variable 'p'.

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

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

Factor a trinomial.
(-10 + -1p)(9 + -1p) = 0

Subproblem 1

Set the factor '(-10 + -1p)' equal to zero and attempt to solve: Simplifying -10 + -1p = 0 Solving -10 + -1p = 0 Move all terms containing p to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + -1p = 0 + 10 Combine like terms: -10 + 10 = 0 0 + -1p = 0 + 10 -1p = 0 + 10 Combine like terms: 0 + 10 = 10 -1p = 10 Divide each side by '-1'. p = -10 Simplifying p = -10

Subproblem 2

Set the factor '(9 + -1p)' equal to zero and attempt to solve: Simplifying 9 + -1p = 0 Solving 9 + -1p = 0 Move all terms containing p to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -1p = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -1p = 0 + -9 -1p = 0 + -9 Combine like terms: 0 + -9 = -9 -1p = -9 Divide each side by '-1'. p = 9 Simplifying p = 9

Solution

p = {-10, 9}

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