if f(x)= 4x^2-2x+5 find (2+y)

Answer 1

This question is poorly worded and can be interpreted in two ways;

If the questioner means that y = f(x)

then (2+y) is simply f(x)+2 = 4x^2 -2x +5 + 2 = 4x^2 -2x +7

If he meant, what is f(2+y) then the answer is

f(2+y) = 4(2+y)^2 – 2(2+y) + 5 = 4(2+y)^2 - 4 – 2y + 5 = 4(2+y)^2 -2y -1

= 16 + 16y + 4y^2 -2y - 2  = 4y^2 +14y +14