Question

Show that -1,3,6 are the zeroes of the polynomial f(x)=x^3-8x^2+9x+18. Also verify the relationship b/w the zeroes and coefficient of f(x)

Answer 1

HELPMEPLEASEEEEEEEEEEEEEEEEEEEE

Answer 2

What you have to do is set up your formula to equal 0, then plug in -1,3,6 for X.

Answer 3

Have you considered substituting the provided values? Synthetic division would help speed that up.

Have you considered factoring the polynomial. That might be the fastest of all.

Answer 4

Using -1
-1 ^3 = -1
-8*(-1^2) = -8
9*x = -9
+18 = 18

Sums to 0

3 and 6 will also sum to zero.