Question

Which shows the factors of x^3-3x^2+4x-12?


A. (x^2+4)(x-3)
B. (x^2-4)(x+3)
C. (x^2-2)(x+6)
D. (x^2+2)(x-6)

Answer 1

expand each one
eg B

= x^2*x + 3x^2 - 4x - 12
= x^3 + 3x^2 - 4x - 12
-so its not this one

can you continue with this?

Answer 2

try expanding A

Answer 3

X^3-12

Answer 4

X^3+4x-3x^2-12?

Answer 5

ok - you've multiplied x by x^2 and + 4 by -3

but how about x^2 by -3 and + 4 by x?

Answer 6

right
so is it A?

Answer 7

Right!

Answer 8

That was so easy. Thanks!

Answer 9

yea - easy when yu now how.


yw