Question

What polynomial has roots of -1, -2, and 3 ?

Answer 1

x3 + 6x2 + 11x + 6
x3 - x2 - 5x + 2
x3 + 2x2 - 7x + 2
x3 - 7x - 6

Answer 2

You can eliminate the middle 2 immediately. You tell me why.

Hint: A polynomial with a root of -1 has a factor of (x-(-1)) = (x+1)

Answer 3

is it x^3 + 6x^2 + 11x + 6 because the bottom can't have 3 roots, right?

Answer 4

Sorry. The bottom one has three.

Answer 5

so its the bottom one?

Answer 6

I don't know. You tell me.

1) Why did I first discard the middle two?
2) What other information do we need?