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Mathematics
Problem
4. If
a
⃗
=
b
⃗
+
c
⃗
\vec{a}=\vec{b}+\vec{c}
a
=
b
+
c
, then is it true that
∣
a
⃗
∣
=
∣
b
⃗
∣
+
∣
c
⃗
∣
|\vec{a}|=|\vec{b}|+|\vec{c}|
∣
a
∣
=
∣
b
∣
+
∣
c
∣
? Justify your answer.
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