Question

1

Answer 1

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

// multiply out

\[(x+3)(x-5) = x^{2}+3x-5x-15 = x^{2}-2x-15\]

Answer 2

Thank you very much!! what does the mulplicity of 2 mean though? I was confused at that.

Answer 3

i found this explanation for multiplicity: "Multiplicity can be thought of as "How many times does the solution appear in the original equation?""

http://en.wikipedia.org/wiki/Multiplicity_(mathematics)

this is interesting because each of the two roots only shows up once in the original equation.

an example of multiplicity 2 would be if you had y = (x-1)^2 where your roots would be 1,1.

Answer 4

Okay, thank makes more sense, thank you!!

Answer 5

yw