Question

Please help me start:: Find all values of x such that (x,1,x) and (x,-6,1) are orthogonal.

Answer 1

if the vectors are orthogonal, their dot product =0
do you know how to take dot product ?

Answer 2

yeah, one sec

Answer 3

x^2 - 6 + x? or x^2 + x - 6?

Answer 4

then i take it i should factor and set them = to 0?

Answer 5

so x = -3, 2 ?

Answer 6

they both are same
just equate that =0
and you will get a quadratic which needs to be solved.
can u ?

Answer 7

yes, do it..

Answer 8

oh, the quadratic? yea, one sec please

Answer 9

haha! I got the same 2 answers. -3 and 2. thank you

Answer 10

x=-3,2 is correct.

Answer 11

welcome ^_^