Question

find a polynomial function of degree 3 with -1,3,5 as zeros

Answer 1

(x + 3)(x - 3)(x - 5)

expand this to get your polynomial

Answer 2

oops sorri
the first 3 should be a 1
(x + 1)(x - 3)(x - 5)

Answer 3

can you expand this?

Answer 4

no

Answer 5

do the last 2 factors first
(x - 3)(x - 5) = x^2 -5x - 3x + 15
= x^2 - 8x + 15

Answer 6

now multiply by the (x + 1):
(x + 1)(x^2 - 8x + 15)
now multiply the 3 terms in second bracket by x then multiply them by + 1
and simplify the result
i'll start you off:

x*x^2 - 8x*x + 15*x +1*x^2 +

do you follow the method?

Answer 7

yes thank you

Answer 8

yw