1.

Letvec(a) = xhat(i) + 3hat(j) and = (x – 1)hat(i) – 2hat(j) and angle between vec(a) and vec(b) is obtuse then number of possible integral values of x is

Answer»


Solution :`VEC(a) cdot vec(b) lt 0`
`implies x^(2) - x - 6 lt 0`
`implies (x-3) (x+2) lt 0`
`implies x in (-2, 3)`.


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