Question

Factor: 9x^4-18x^2+8

Answer 1

heeelllp

Answer 2

Let u=x^2
\[9u^2-18u+8\]
Factorise like a normal quadratic.

Answer 3

But it's ^4
I don't know how to factor that

Answer 4

@bigworm Read what I wrote mate. Pay attention.

Answer 5

Well mate that didn't help

Answer 6

That does help @bigworm I told you to factorise this:
\[9u^2-18u+8\]

Answer 7

You let u=x^2 which basically means, everytime you see x^2 you substitute u. And for x^4 it is the same as
\[x^4=x^2\times x^2\]
\[x^4=u\times u\]
\[x^4=u^2\]
So now when you see x^4, you substitute u^2

Answer 8

@bigworm you there?

Answer 9

or are you waiting for someone to hand over the answer to you?

Answer 10

I was waiting for someone to solve it out for me so I know how to do the rest of the problems

Answer 11

Yeah that's a pretty good plan if you want to get low marks for maths.

Answer 12

In exams, markers don't just want answers. They want to see if you undertood your maths through the working you provided when answering questions.

Answer 13

understood*