Question

Solve without guessing method: x^2+(9x^2)/(x+3)^2=16

Answer 1

x^2+9x^2/x^2+9+6x=16

x^4+9+6x+9x^2=16x^2+144+96x

x^4-7x^2-90x-135=0

let x^2=y

y^2-7y-90√y-135=0

y^2-y(7+90/√y)-135=0

proceeding it,u will get the solution