Question

if f(x)=2x+8 then find f(x+3)-f(3)\2x​

Answer 1

f ( x ) = 2x + 8

put x = x + 3

f ( x + 3 ) = 2(x + 3) + 8

= 2x + 6 + 8

= 2x + 14

f ( 3 ) = 2 ( 3 ) + 8

= 6 + 8

= 14

[ f ( x + 3 ) – f ( 3 ) ] / 2x

= ( 2x + 14 – 14 ) / 2x

= 2x / 2x

= 1