Problem, set a = {x |- 1

Set b = {x | x ≥ 3 or x≤-2}

Therefore, a ∩ b = {x | 3 ≤ x < 4}

(2)

Axe? +bx+8 & gt； The solution set of 0 is a.

So, this inequality is equivalent to x? -3x-4 & lt； 0

That is -2x? +6x+8 & gt； 0

Because the corresponding coefficients are equal.

So, a=-2 and b=6.