1.

Prove that the plane 2x + 2y + 4z = 9 is perpendicular to each of the planes x + 2y + 2z – 7 = 0 and 5x + 6y + 7z = 23.

Answer»

To show that planes are perpendicular

A1A2 + B1B2 + C1C2 = 0

Where A1, B1, C1 are direction ratios of plane and A2, B2, C2 are of other plane. 

2.1 + 2.2 + 4.2 = 2 + 4 + 8 =14 ≠ 0 

Hence, planes are not perpendicular. 

Similarly for the other plane 

2.5 + 2.6 + 2.7 =10 + 12 + 14 = 36 ≠ 0 

Hence, planes are not perpendicular.



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