The value of $$p^2 - 7p+12$$ at p = 3 is:

Expression: $$p^2 - 7p + 12$$​​
Value of p = 3

Substitute p = 3 into the expression:

​$$= p^2 - 7p + 12 \\ \ \\ = (3)^2 - 7(3) + 12$$​​

= 9 - 21 + 12

= 0