Given the function f (x) = x2+2x+1, find: f (2b)

Given the function f (x) = x2+2x+1, find: f (2a-3/5)

I will do the first one only. The second question is done the same way.

Replace every x you see in the function with 2b and do the math.

f (x) = x^2 + 2x + 1

Let x = 2b

f (2b) = (2b) ^2 + 2 (2b) + 1

f (2b) = 4b^2 + 4b + 1

Did you follow? That's all there is to it.