I 20x^2-4xy-8xz+17y^2-16yz+5z^2 = 0 Expanding and simplifyingII 20x^2-4x(2x)-8xz+17(2x)^2-16(2x)z+5z^2 = 0 Set y=2xIII 80x^2-40xz+5z^2 = 0 SimplifyingIV 5(z-4x)^2 = 0 Completing squareV y=2x, z=4x

is one possible method

blackjack

flooble's webmaster puzzle