Question

i needed to edit this question :p

Answer 1

x^4 - 41x^2 + 400 = 0
let x^2 = y
y^2 - 41y + 400 = 0

you can solve this by factoring

then use X = x^2 to fing the 4 solutions

Answer 2

* typ
then use y = x^2 to find the 4 solutions

Answer 3

I can't give you the solutions
Hint:- on factoring the equation:- + 400 = -16 * - 25

Answer 4

y^2 - 41y + 400 = 0
(y - 16)(y - 25) = 0

now you can find the 2 values of y

then find the values of x by plugging in these values of y into the equation y = x^2