Question

P = 3mi + 4 mj -12 mk Dan P = 26 . Carilah nilai m

Answer 1

P^2 = (3m)^2 + (4m)^2 + (-12m^2)
26^2 = 9m^2 + 16m^2 + 144m^2
676 = 169m^2
m^2 = 4
m^2 - 4 = 0
(m - 2)(m + 2) = 0
m = 2 atau m = -2