Answer:
 f(2b) = 4b^2 +4b +1
Step-by-step explanation:
Put 2b where x is and simplify.
 f(2b) = (2b)^2 +2(2b) +1
 f(2b) = 4b^2 +4b + 1
 
        
             
        
        
        
Answer:
 y-intercept is the value of y when x is equal to zero. Because the y intercept is a point on a graph, you'll usually write it in point/ coordinate form.
Step-by-step explanation:
The y-intercept is where the parabola of a function crosses (or intercepts) the y axis.