3.17 A plane contains the vectors A and B. Determine the unit vector normal to the plane when A and B (a) 7i+ 8j - 2k and 9i – 4j – 5k, (b) 6i – 3j + 9k and -5i + 4j - 3k

Calculus: Early Transcendentals
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Chapter1: Functions And Models
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3.17 A plane contains the vectors A and B. Determine the unit vector normal to the plane when A and B are equal to, respectively,
(a) 7i+ 8j - 2k and 9i – 4j – 5k, (b) 6i − 3j + 9k and −5i + 4j – 3k
Transcribed Image Text:3.17 A plane contains the vectors A and B. Determine the unit vector normal to the plane when A and B are equal to, respectively, (a) 7i+ 8j - 2k and 9i – 4j – 5k, (b) 6i − 3j + 9k and −5i + 4j – 3k
Expert Solution
Step 1

(a) vector A = 7i+8j-2k    and     B = 9i-4j-5ka plane contains both vectors A     and  B   so  normal vector to the plane is = A×B

now , A×B=ijk78-29-4-5 = i(-40-8)-j(-35+18)+k(-28-72)=-48i+17j-100kand  A×B = 12593

so unit normal vector = 112593-48i+17j-100k

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