Q. 4 A5.0( 1 Vote )
Determine the value of λ for which the following planes are perpendicular to each other.
Given planes, and
We know that planes and are perpendicular if
We have and
⇒(λ + 4 – 21) = 0
⇒λ = 21 – 4 = 17
Hence, for λ = 17 the given planes are perpendicular.
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