20. If A = i +j+ k, B=4î+49 +4Ń and Ř=A+B
then angle that Ř makes with Ā is :-
Answers
Answered by
0
Explanation:
7x−4y−4k
=1[
3
−2x−y+2z
]
\dfrac {7x-4y-4k}{9}=1\left [\dfrac {-2x-4+2z}{3}\right]
9
7x−4y−4k
=1[
3
−2x−4+2z
]
7x-4y-4k=\pm [-6x-3y+6z]7x−4y−4k=±[−6x−3y+6z]
takes the
7x-4y-4k=-6x-3y+6z7x−4y−4k=−6x−3y+6z
13x-y-10k=013x−y−10k=0
take -'ve'−
′
ve
′
7x-4y-4k=6x+3y-6z7x−4y−4k=6x+3y−6z
\boxed {x-7y+2z=0}
x−7y+2z=0
magnitude =\sqrt {1+49+4}=\sqrt {54}=2\sqrt {13}=
1+49+4
=
54
=2
13
So it should be it is Answer
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