Find the value of the function y=3x2−21 when x=4 .

Answer 1

To find the value of the function when x=4, we substitute 4 into the equation for x:

y = 3(4)^2 - 21

Simplifying:

y = 3(16) - 21
y = 48 - 21
y = 27

Therefore, when x=4, the value of the function is y=27.