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CBSE Class 12 Math 2020 Outside Delhi Set 1 Solved Paper

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Question : 36
Total: 36
Show that the lines
→
r
=
→
a
+λ
→
b
 and
→
r
=
→
b
+µ
→
a
 are coplanar and the plane containing them is given by
→
r
â‹…(
→
a
×
→
b
)=0.
Solution:     👈: Video Solution
Condition for Coplanarity of Two Lines in Vector Form
If the lines
→
r
=
→
a1
+λ
→
b1
 and
→
r
=
→
a2
+µ
→
b2
 are coplanar,
then
→
r
∙(
→
b1
×
→
b2
)=
→
a2
∙(
→
b1
×
→
b2
)
Substituting above values in this equations
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