Question

Which value is not a zero of P(x) = x^3 + 3x^2 - x - 3?

f 1
g -3
h -1
j 3

Answer 1

After plugging in which value for x, will the p(x) NOT be equal to zero ?

Answer 2

\[P(x) = x^3 + 3x^2 - x - 3\]\[P(x) = x^2(x + 3) -( x + 3)\]\[P(x) = (x^2-1)(x + 3) \]this is what we get when we factor them.

\[x^2-1=0~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~x+3=0\]\[(x-1)(x+1)=0~~~~~~~~~~~~~~~~~~x=-3\]\[x=±~1\]

Answer 3

Which of the options is not zero ?

Answer 4

3

Answer 5

Yes, 3 is the only correct option :)

Answer 6

thank you!

Answer 7

Anytime !