Question

my paper is going on of math please see the pic ​

Answer 1

Answer:

(a) x ∈ (-∞,2)U(7,∞) ; if f(x)>0

x ∈ (2,7) ; if f(x) < 0

(b) x ∈ (-∞,-6)U(-4,-2)U(4,∞) ; if f(x)>0

x∈(-6,-4)U(-2,4) ; if f(x)<0