© examsiri.com
Question : 30 of 120
Marks:
+1,
-0
Solution:
Given,
a⋅b=−20 $
⇒({i↖{∧}+λ {j↖{∧}-2 {k↖{∧}) ⋅(2 {i↖{∧}-3 {j↖{∧}+5 {k↖{∧}) \;\; =-20 $
⇒2−3λ−10‌‌=−20 ⇒−3λ=−20+8‌‌=−12 ⇒λ‌‌=4
© examsiri.com
Go to Question: