Let u =7i-3j and w=-i-5j. find ||w-u||?

w - u = - 8 i - 2 j

I w - u I = [ 68 ]^(1/2) = 2 √17

u = 7i – 3j

w = -i – 5j

║ w - u ║

w – u = - i – 5j – (7i – 3j)

= - i – 5j -7i + 3j

= - 8i – 2j

|w - u| = √ [(8)² + (2)²]

= √ (64 + 4)

= √ (68)

= 2√ (17)

||w-u|| = 2 sqrt(17)