Question

do only 11 (ii) and 12 (iii)

Answer 1

11(ii)
f(-1/2)=0
Hence -1/2 is a zero of f(x)
Hence x=-1/2
2x=-1
2x+1=0
Hence this is a factor of f(x)

12(iii)
f(x)=2x+5
Put x=-x
f(-x)=2(-x)+5
=5-2x
f(x) + f(-x)
=2x+5+5-2x
=10