p^2-21=-4p

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Solution for p^2-21=-4p equation:


Simplifying
p2 + -21 = -4p

Reorder the terms:
-21 + p2 = -4p

Solving
-21 + p2 = -4p

Solving for variable 'p'.

Reorder the terms:
-21 + 4p + p2 = -4p + 4p

Combine like terms: -4p + 4p = 0
-21 + 4p + p2 = 0

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

Subproblem 1

Set the factor '(-7 + -1p)' equal to zero and attempt to solve: Simplifying -7 + -1p = 0 Solving -7 + -1p = 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 + -1p = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -1p = 0 + 7 -1p = 0 + 7 Combine like terms: 0 + 7 = 7 -1p = 7 Divide each side by '-1'. p = -7 Simplifying p = -7

Subproblem 2

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

Solution

p = {-7, 3}

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