Question

using the quadratic formula: x^4-18x^2+17=0

Answer 1

replace x^2 by y
you will get a quadratic in y

Answer 2

u=x^2
u^2 =x^4
u^0 = x^0
sub.s in and solve for

Answer 3

u

Answer 4

simply put
a=1, b= -18 and c= 27 in quadratic formula..
normally quadratic formula is used to determine the value of "x" but here in your case you'll be finding values of "x^2"...

Answer 5

let y= x^2
y^2=x^4
substitute in there and solve by the formula