**Answer:**

(i)

For plane perpendicular, cos 90^{0} = 0

(ii)

For plane perpendicular, cos 90^{0} = 0

(λ × 1) + (2 × 2) + (3 × -7) = 0

λ + 4 – 21 = 0

λ = 17

Find the value of λ for which the given planes are perpendicular to each other: (i) and (ii) and .

Find the value of λ for which the given planes are perpendicular to each other: (i) and (ii) and .

**Answer:**

(i)

For plane perpendicular, cos 90^{0} = 0

(ii)

For plane perpendicular, cos 90^{0} = 0

(λ × 1) + (2 × 2) + (3 × -7) = 0

λ + 4 – 21 = 0

λ = 17