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Verified answer
Jawabp = 2a- b + 3c
p = 2(2, -1, 3) - (3, 4, 5) + 3(1, -2, 4)
p = (4, -2, 6) - (3, 4 , 5) + (3, - 6, 12)
p = (4 -3+3)i + (-2-4-6)j + (6 -5 +12)k
p = 4i - 12j + 13 k
|p| = √(4²+(-12)² +(13)²) = √329