Answer:
-5/4
Explanation:
To evaluate the function, put the value of the argument where the variable is and do the arithmetic.
Function evaluation
f(x) = -x -3x²
f(1/2) = -(1/2) -3(1/2)² = -1/2 -3(1/4) . . . . . use 1/2 in place of x
f(1/2) = -2/4 -3/4 = -5/4
The value in simplest form is ...
f(1/2) = -5/4