If à and b are two non collinear unit vectors and lã+ 5l = √3, then find the value of (ā-b). (2a+b)
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(2
a
ˉ
−5
b
ˉ
),(3
a
ˉ
+
b
ˉ
)
=6∣
a
ˉ
∣
2
+2
a
ˉ
.
b
ˉ
−15
a
ˉ
.
b
ˉ
−5∣
b
ˉ
∣2
=6−13
a
ˉ
.
b
ˉ
−5
=1
2
−13
=
2
−11
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