Angle between vectors

[hollow light]

I got two values of x, -4 and 0 but zero seems to be the only correct answer as it gives me positive 1/2, -4 gives me -1/2

[ashen gazelle]

Ya...right
....I too got the same ans..

[hollow light]

I m just gonna go with x = 0 because thats the only value that actually satisfies the question

[ocean cypress]

do you still need help with this?