Question

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

Answer 1

Answer: So, when x = 4, the value of the function y is 27.

Explanation: To find the value of the function y = 3x^2 - 21 when x = 4, you simply substitute 4 for x in the equation and calculate the result:

y = 3x^2 - 21

y = 3(4^2) - 21

y = 3(16) - 21

y = 48 - 21

y = 27

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