The problem that Cal factored was a perfect square trinomial. The standard formula for a trinomial like this would be a2 + 2ab + b2= (a + b)2 and (a + b)2.
psquared-18p+81
Step 1: The middle term is the product of the square root of psquared and 81, which are p and 9, both multiplied by two, which equals 18p.
Step 2: Put the bases of a and c into parentheses, put a minus sign between them, raise them to the power of 2.
(p-9)squared
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