Question

if y^2+1/y^2=18 find the value of y^4+1/y^4​

Answer 1

Answer:

322 is the answer___tell if its true

Answer 2

Answer:

y^2+1/y^2=18

=>(y^2+1/y^2)^2=18^2{squaring both the sides}

=>y^4+1/y^4+2×y^2×1/y^2=324

=>y^4+1/y^4=324-2=322