Find the value of the function y = 3x^2 − 21 when x = 4.

Answer 1

Substitute x = 4 in the given expression:

y = 3(4)^2 - 21

y = 3(16) - 21

y = 48 - 21

y = 27

Therefore, the value of the function y = 3x^2 − 21 when x = 4 is 27.