SOLUTION: For which a value will the vector (1, a, a + 1) be perpendicular to the vector (−3, 1, a)? a. −1 b. -3 c. 3 d. 0 Thank you.

Algebra ->  Test -> SOLUTION: For which a value will the vector (1, a, a + 1) be perpendicular to the vector (−3, 1, a)? a. −1 b. -3 c. 3 d. 0 Thank you.      Log On


   

Question 1163716: For which a value will the vector (1, a, a + 1) be perpendicular to the vector
(−3, 1, a)?
a. −1
b. -3
c. 3
d. 0
Thank you.
Answer by ikleyn(52780) About Me  (Show Source):
You can put this solution on YOUR website!
.

        HINT


Scalar product should be equal to zero.

It gives a quadratic equation for "a".


Alternatively, you can substitute the given optional values of "a" into the vectors and check the scalar product.