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