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Question

Prove that [abc+d]=[abc]+[abd]

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Solution

[abc+d]=[abc]+[abd]
If a=x1^i+y1^j+z1^k
b=x2^i+y2^j+z2^k
c=x3^i+y3^j+z3^k
d=x4^i+y4^j+z4^k
[ab.c+d]=∣ ∣ ∣x1y1z1x2y2z2x3+x4y3+y4z3+z4∣ ∣ ∣
=∣ ∣ ∣x1y1z1x2y2z2x3y3z3∣ ∣ ∣+∣ ∣ ∣x1y1z1x2y2z2x4y4z4∣ ∣ ∣ (properties of determinants)
=[abc]+[abd]

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