p^2-28=21

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Solution for p^2-28=21 equation: 


Simplifying
p2 + -28 = 21

Reorder the terms:
-28 + p2 = 21

Solving
-28 + p2 = 21

Solving for variable 'p'.

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

Add '28' to each side of the equation.
-28 + 28 + p2 = 21 + 28

Combine like terms: -28 + 28 = 0
0 + p2 = 21 + 28
p2 = 21 + 28

Combine like terms: 21 + 28 = 49
p2 = 49

Simplifying
p2 = 49

Take the square root of each side:
p = {-7, 7}

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