Question

finding the zero algebraically for f(x)=2x^4-2x^2-40
helpp??

Answer 1

put x^2 = y
u get a quadratic in y.
solve it to get 2 values of y

Answer 2

thats not giving me a zero though, like x=2 or x=0..

Answer 3

firstly it will give 2 values of y,
did u get those?

Answer 4

no i just got x=y

Answer 5

O.o

how??

Answer 6

never mind.
well then maybe sq. root of + or - y?

Answer 7

yes, x= + or -sq. root of y
but for hat u need to find y first

Answer 8

*that

Answer 9

ok thank you

Answer 10

ask if u need further help in this question

Answer 11

ok thanks (:

Answer 12

welcome ^_^ and
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