Question

Four polynomial functions are shown below:
f(x) = x3 + 3x2 - 4x - 12
g(x) = x2 - x - 2
p(x) = x3 + 3x + 2
t(x) = x2 + x - 2

Which of the following functions has -1 and 2 as its zeros?


f(x)
g(x)
p(x)
t(x)

Answer 1

@Crissy15

Answer 2

Hi!

Answer 3

test ONE BY ONE to figure out the correct one.

Answer 4

test??
you mean solve each one?

Answer 5

For example:
f(x)
put -1 in, you have \(f(-1) = (-1)^3 +3(-1)^2-4(-1) -12 =-6\) hence -1 is NOT a root of f(x) , therefore, f(x) is NOT the correct solution.
do the same with other options.

Answer 6

ah!! i see! i don't know how to do the other ones the only one i knew how was the first on! could you maybe guide me in steps to do this next one?

Answer 7

I guided you all, now your turn to show your brain.

Answer 8

well my issue is i know how to do equations with 4 number in them but i don't know what to do with ones that have 3

Answer 9

you can cancel out p(x) as all the terms are adding so a positive number like 2 will give a positive value in p(x) and it can never be 0 for positive values

Answer 10

try the her 3 polynomials

Answer 11

other not her lol

Answer 12

okay! what would be the first step in solving a trinomial?

Answer 13

Why do you need solving them?

Answer 14

to this kind of problem, just plug the GIVEN solutions in. Dat sit

Answer 15

what are you seriouse??

Answer 16

what do you mean? I got mad because you complicate the problem while you have a very simple way to get the answer.

Answer 17

When students struggle with a simple problem, the potential they give up is so high. I don't want it. That is why I always give out the simplest way to solve the problems (if there is some and I know it)

Answer 18

okay! sorry i mad you mad. I always over complicate these things!

Answer 19

made*