s the vector ở = (-1,–2,3) perpendicular to the plane 3x + 6y – 9z + 5 = 0? %3D
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Transcribed Image Text:**Question:**
Is the vector **v** = ⟨−1, −2, 3⟩ perpendicular to the plane 3x + 6y − 9z + 5 = 0?
**Explanation:**
In order to determine if the vector **v** is perpendicular to the plane, we need to find out if **v** is normal to the plane. A vector is normal (perpendicular) to a plane if it is parallel to the normal vector of the plane.
The equation of the plane is given as 3x + 6y − 9z + 5 = 0. The coefficients of x, y, and z (3, 6, and -9) form the normal vector of the plane.
Thus, the normal vector **n** of the plane is ⟨3, 6, −9⟩.
To check if **v** is perpendicular to the plane, it should be parallel to **n**. Two vectors are parallel if one is a scalar multiple of the other.
By comparing **v** = ⟨−1, −2, 3⟩ with **n** = ⟨3, 6, −9⟩, we can see that there is no scalar k such that k * ⟨3, 6, −9⟩ equals ⟨−1, −2, 3⟩.
**Conclusion:**
Therefore, the vector **v** = ⟨−1, −2, 3⟩ is not perpendicular to the plane 3x + 6y − 9z + 5 = 0.
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