Question

Solving an equation that can be written in quadratic form

Answer 1

\[x^4-20x^2=-64\]
\[(x^2)^2-20x^2+64=0\]
*substitute u=x^2*
\[u^2-20u+64\]
\[(-u+16)(-u+4)\]

Answer 2

u=4,2?????

Answer 3

@TuringTest plz?

Answer 4

@myininaya plz?

Answer 5

@phi plz?

Answer 6

@ash2326 plz?

Answer 7

i think it is plus of minus 2, and 4

Answer 8

i thought correctly THANKS OPENSTUDY FOR ALL YOUR HELP @phi @myininaya @TuringTest