Question

Which are real zeroes of this function?
x3 + 2x2 – 9x – 18

Answer 1

1, 2, 3
3, -3, 2
2, 3, -6
1, -1, 18
-2, 3, -3

Answer 2

@aloud

Answer 3

HI!!

Answer 4

since you have choices, you could check them
plug in the numbers and see which ones give you zero
or you could cheat which is a lot easier

Answer 5

u got this misty?

Answer 6

cheat

Answer 7

\[f(x)=x^3 + 2x^2 – 9x – 18\] lets try 1

Answer 8

\[f(1)=1+2-9-18\]which , whatever it is, is not 0, so we can eliminate any answer with 1 init

Answer 9

@aloud yeah i think so

Answer 10

ok now the cheat method
http://www.wolframalpha.com/input/?i=x%5E3+%2B+2x%5E2+%E2%80%93+9x+%E2%80%93+18