(p-1)(p+2)=0

Solution for (p-1)(p+2)=0 equation:

Simplifying
(p + -1)(p + 2) = 0

Reorder the terms:
(-1 + p)(p + 2) = 0

Reorder the terms:
(-1 + p)(2 + p) = 0

Multiply (-1 + p) * (2 + p)
(-1(2 + p) + p(2 + p)) = 0
((2 * -1 + p * -1) + p(2 + p)) = 0
((-2 + -1p) + p(2 + p)) = 0
(-2 + -1p + (2 * p + p * p)) = 0
(-2 + -1p + (2p + p2)) = 0

Combine like terms: -1p + 2p = 1p
(-2 + 1p + p2) = 0

Solving
-2 + 1p + p2 = 0

Solving for variable 'p'.

Factor a trinomial.
(-2 + -1p)(1 + -1p) = 0

Subproblem 1
Set the factor '(-2 + -1p)' equal to zero and attempt to solve:

Simplifying
-2 + -1p = 0

Solving
-2 + -1p = 0

Move all terms containing p to the left, all other terms to the right.

Add '2' to each side of the equation.
-2 + 2 + -1p = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -1p = 0 + 2
-1p = 0 + 2

Combine like terms: 0 + 2 = 2
-1p = 2

Divide each side by '-1'.
p = -2

Simplifying
p = -2
Subproblem 2
Set the factor '(1 + -1p)' equal to zero and attempt to solve:

Simplifying
1 + -1p = 0

Solving
1 + -1p = 0

Move all terms containing p to the left, all other terms to the right.

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

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

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

Divide each side by '-1'.
p = 1

Simplifying
p = 1
Solution
p = {-2, 1}