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Question : 19 of 90
Marks:
+1,
-0
Solution:
Let
=a1+a2+a3and
⋅(3−‌+2)=0⇒3a1+‌+2a3=0..... (i)
and
×(2+)=2−13−4⇒a2+(2a3−a1)−2a2=2−13−4∴a2=2..... (ii)
and
a1−2a3=13..... (iii)
From eq. (i) and (iii) :
a1=3 and
a3=−5∴=3+2−5∴ projection of
on
2+2+=‌=‌
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