Question

Factor Completely
x 4 - 19x 2 + 48

Answer 1

x^4 - 19x^2 + 48
= x^4 - 3x^2 - 16x^2 + 48
= x^2 (x^2 -3) - 16 (x^2 -3)
= (x^2 -16) ( x^2 -3)
Now, use the identity a^2-b^2 = (a-b)(a+b) to factorise (x^2-16)
Can you try it?

Answer 2

I'm so lost here

Answer 3

wait. I get it. Thank you.

Answer 4

Hmm... what did you get?!