disguised quadratics

[kind cobalt]

Can anyone help me on this question please

[ebon prawn]

,rotate

[ebon prawn]

this is way out of my league 👀 sorry

[shut fern]

man said disguised quadratics

tf is that

[silk sapphire]

wtf

this shit aint even cubic

itsa fakin

5ic

wthhh

how year 11

[wary quartz]

ain’t u do
15x^4 -30x^2 - 120=0
x^4-2x^2-8=0
(x+2)(x-2)(x^2+2)
two turning points r
x=2 and x=-2

not sure what to do next tho

f(−2)=254>0
f(2)= -194 <0

there’s 3 roots

cuz both turning points r on different sides

@kind cobalt do u have a ms

[shut fern]

I think hes y12

cus it says A level tag

[wary quartz]

nah he’s probs in y11 just doing alevel stuff

[dawn dust]

It is

U can solve it with disguised