81. If f(x) = 2x + 1, then f(-2)= _____.
-3?
78. If f(x) = 3x - 5, then f(2) = _____.
1?
yes, yes
To find the value of f(-2) given that f(x) = 2x + 1, you need to substitute -2 for x in the function.
So, replace x with -2 in the function:
f(-2) = 2(-2) + 1
Now, simplify the expression:
f(-2) = -4 + 1
f(-2) = -3
Therefore, the answer is -3.