Question

Cat mai repede,vă rog!​

Answer 1

a = i + j

b = -i + 3j

v = 3i - 2j

v = m·a + n·b

v = m(i + j) + n(-i + 3j)

v = mi + mj - ni  + 3nj

v = (m-n)i + (m+3n)j

=> m-n = 3  

=> m+3n = -2  

=> 4n = -5 => n = -5/4 => m = 3 + n => m = 3 - 5/4 => m = 7/4

=> v = (7a - 5b)/4