Question

if the function f is defined by function f of x (2 times x) plus 3, and if function f of a equals 11, what is the value of a?

Answer 1

f(x) = 2x + 3
f(a) = 2a + 3
when f(a) = 11
11 = 2a + 3
therefore 2a = 8 
 and a = 4

Answer 2

Answer is A! ~The value of a function f of x is equal to 3 times x. What is the value of the function when x = 8?