Question

Check whether x=2/3 and x=-1/3 are roots of 9x²-3x-2

Answer 1

Answer:

=9(2/3)^2-3(2/3)-2

=4-2-2

=0

so 2/3 is a root

now for x=-1/3

=9(-1/3)^2-3(-1/3)-2

=1+1-2

=0

so it's also a root