Question

se f (x)=x2+x,então quanto vale f(3)????

Answer 1

f(x) = x² + x
f(3) = 3² + 3
f(3) = 9 + 3
f(3) = 12

Answer 2

f(X) = 2x+x
então f(3)= 3.3+3
9+3 = 12