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5 = (-3, -1, x)(3, -2, 6) / √(3^2 + (-2)^2 + 6^2)
5 = (-9 + 2 + 6x) / √(9 + 4 + 36)
5 = (-7 + 6x) / √49
5 = (-7 + 6x) / 7
5 × 7 = -7 + 6x
35 = -7 + 6x
35 + 7 = 6x
x = 42 / 6 = 7 (e)
(a.b)/│b│=5
((-3,-1,x).(3,-2,6))/│3,-2,6│= 5
((-3).3+(-1)(-2)+x.6)/(√(3²+(-2)²+6²)) = 5
(-9+2+6x)/(√(9+4+36) = 5
(-7+6x)/(√(49) = 5
(-7+6x)/7 = 5
-7+6x = 5.7 = 35
6x = 35+7 = 42
x=42/6
x=7