Question 61502
a) 
if x = 0 then  f(0) = 7 - 2*0  =>  y = 7
if x = 1 then  f(1) = 7 - 2*1  =>  y = 4
if x = 2 then  f(2) = 7 - 2*2  =>  y = 3
if x = 3 then  f(2) = 7 - 2*3  =>  y = 1
if x = 5 then  f(2) = 7 - 2*5  =>  y = -3
if x = -1 then  f(-1) = 7 - 2*(-1)  =>  y = 7+2 = 9

b)  f(x) = x2 +  x  

if x = 0  then  f(0) = 0^2 + 0 => y = 0
if x = 3  then  f(3) = 3^2 + 3 => y = 9 + 3 = 12
if x = 5  then  f(5) = 5^2 + 5 => y = 25 + 5 = 30


regards
kapil
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