Question

大学数学问题，如图，求解答

最好是手写的，感谢！

Answer 1

f(x)
=x+2 ; x<2
=ax^2 ; x=2
=b ; x>2
f(2-)
=lim(x->2-) (x+2 )
=4
f(2) = 4a
f(2+)
=lim(x->2+) b
=b
f(2-)=f(2) =f(2+)
4=4a=b
ie
(a,b)=(1,4)

Answer 2