Question

Ans any 2 of the following​

Answer 1

Answer:

$solution: \: \\ l(xy)= \sqrt{7} \: ;l(xz)=3 \sqrt{7} \\ l(xy) + l(yz) = l(xz) \: . \: . \: .(x - y - z) \\ ∴ \sqrt{7} + l(yz) = 3 \sqrt{7} \\∴ l(yz) = 3 \sqrt{7} − \sqrt{7} \\ ∴l(yz)=2 \sqrt{7}$