2, if
1
( )
2 , if
1
1
2,
if
1
x
f x
x
x
x
−
≤ −
=
− <
≤

>

17 Find the relationship between a and b so that the function f defined by
1, if
3
( )
3, if
3
ax
x
f x
bx
x
+
≤
= 
+
>

is continuous at x = 3 18 For what value of λ is the function defined by
(2
2 ), if
0
( )
4
1,
if
0
x
x
x
f x
x
x
λ
−
≤
= 
+
>

continuous at x = 0