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Question : 100 of 100
Marks:
+1,
-0
Solution:
Given :
=(α,1,−1) and
=(2,1,−α)=×=||=(−α+1)+(α2−2)+(α−2)Projection of
on
=−+2−2.=|⋅‌|=30‌ Given ‌}⇒=|‌| α−1−4+2α2−2α+4 |
| √1+4+4 |
|=30On solving
α=‌ (Rejected as
.α>0) and
α=7
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