-2p^2=p-21

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Solution for -2p^2=p-21 equation:


Simplifying
-2p2 = p + -21

Reorder the terms:
-2p2 = -21 + p

Solving
-2p2 = -21 + p

Solving for variable 'p'.

Reorder the terms:
21 + -1p + -2p2 = -21 + p + 21 + -1p

Reorder the terms:
21 + -1p + -2p2 = -21 + 21 + p + -1p

Combine like terms: -21 + 21 = 0
21 + -1p + -2p2 = 0 + p + -1p
21 + -1p + -2p2 = p + -1p

Combine like terms: p + -1p = 0
21 + -1p + -2p2 = 0

Factor a trinomial.
(3 + -1p)(7 + 2p) = 0

Subproblem 1

Set the factor '(3 + -1p)' equal to zero and attempt to solve: Simplifying 3 + -1p = 0 Solving 3 + -1p = 0 Move all terms containing p to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -1p = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -1p = 0 + -3 -1p = 0 + -3 Combine like terms: 0 + -3 = -3 -1p = -3 Divide each side by '-1'. p = 3 Simplifying p = 3

Subproblem 2

Set the factor '(7 + 2p)' equal to zero and attempt to solve: Simplifying 7 + 2p = 0 Solving 7 + 2p = 0 Move all terms containing p to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 2p = 0 + -7 Combine like terms: 7 + -7 = 0 0 + 2p = 0 + -7 2p = 0 + -7 Combine like terms: 0 + -7 = -7 2p = -7 Divide each side by '2'. p = -3.5 Simplifying p = -3.5

Solution

p = {3, -3.5}

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