Find the value of the function y=3x2−21 when x=4 .
To find the value of the function y=3x^2−21 when x=4, we substitute x=4 into the function:
y = 3(4)^2 - 21
Simplifying the equation, we have:
y = 3(16) - 21
y = 48 - 21
y = 27
Therefore, the value of the function y=3x^2−21 when x=4 is 27.