Question

Stiind ca x la puterea 2+y la puterea 2=34 si xy=2 calculati x la puterea 4+y la puterea4.

Answer 1

$(x^2+y^2)^2=x^4+2x^2y^2+y^4$

$(x^2+y^2)^2-2x^2y^2=x^4+y^4$

$34^2-2*2^2=1148$