Q. 4 A5.0( 1 Vote )

# Determine the value of λ for which the following planes are perpendicular to each other.

and

Answer :

Given planes, and

We know that planes and are perpendicular if

We have and

Now,

⇒(λ + 4 – 21) = 0

⇒λ = 21 – 4 = 17

Hence, for λ = 17 the given planes are perpendicular.

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