Question

PLZ HELP!!!
Slove
w^4-18w^2-2=0

Answer 1

substitute w^2 as a

Answer 2

?

Answer 3

w^2=a
then you will get quadratic equation

Answer 4

w^4-18w^2-2=0 as he says substitute a for w^2
so a^2 = (w^2)^2 = w^4
equation reduces to
a^2 - 18a - 2 = 0
this is a quadratic equation and you can find value of a
then since a = w^2
put values of a = w^2 and take the root to get value of w

Answer 5

So the answer is?

Answer 6

42