Question

If A (3, 2, 1), B(4, x, 5), C(4, 2, -2), D(6, 5, -1) are coplanar, find x.​

Answer 1

Answer:

-1

Step-by-step explanation:

-1 is right answer

please follow me

Answer 2

Answer:

answer is 5

as

det of ab,ac,ad°=o

where ab=ob-oa

as like this do for ac,ad