If a vector = (- 1, x) and B vector = (- x, 2) are collinear and in the same direction, then x=

If a vector = (- 1, x) and B vector = (- x, 2) are collinear and in the same direction, then x=

A vector = (- 1, x) and B vector = (- x, 2) are collinear
Then - 1 / x = - X / 2
Get x = √ 2 or - √ 2
And in the same direction
So x > 0
We get x = √ 2

Let a = (x, 1), B = (4, x), and a and B have opposite directions, then the value of X is______ ．

∵ vector a = (x, 1), B = (4, x), and the direction of a and B is opposite, let a = λ B, then λ < 0, ∵ (x, 1) = λ (4, x), that is, x = 4, λ 1 = λ x {x2 = 4, the solution is x = - 2, x = 2 (rounding off), and the value of ∵ x is - 2. So the answer is - 2

Vector a = (x, 1), B = (9, x), if a and B are collinear and opposite, then X=______ ．

∵ a ∥ B, ∥ x2 = 9, the solution is x = ± 3

(1) If vector a = (2, - x) and vector b = (x, - 8) are collinear and in opposite directions, then x=
(2) I and j are two non collinear vectors. We know that the vector AB = 3I = 2J, the vector CB = I = in J, and the vector CD = 2I + J. if a, B and C are collinear, we can find the value of the real number in
(3) Given P1 (2,3), P2 (- 1,4), and the module of vector p1p = twice the module of vector PP2, the point P is on the extension line of p1p2, then the coordinate of P is

(1) Because they are collinear and in the opposite direction, 2 / x = - X / 8, so x = 4 or - 4