Diketahui v = 2i - 3j + 6k dan w = 4i + 3k, nilai s agar v tegak lurus (v - sw) adalah.. (A) 49/26 (B) 26/49 (C) -26/49 (D) -49/26 (E) -2/49 Beserta penyelesaia

V = 2i - 3j + 6k
W = 4I + 3K

Nilai s agar v tegak lurus (v - sw)
v × (v - sw) = 0
vv - svw = 0
vv = svw

vv = (2, -3, 6) (2, -3, 6) = 4 + 9 + 36 = 49
svw = s (2, -3, 6) (4, 0, 3) = s (8 + 0 + 18) = 26s

vv = swv
s = vv/wv
s = 49/26