Question

(x–4)x<0
Write the solution using interval notation. Use the union symbol ∪ to express the solution as a union of disjoint intervals. Finite endpoints of all intervals should be integers. If there are no solutions, use the symbol ∅ for the empty set. Use the set notation {a} to represent an isolated solution a.

Answer 1

(0,4)
Roots of a polynomial f(x) separate the x-axis into intervals. On each interval, the polynomial f(x) is either entirely positive or entirely negative.

Answer 2

thx!

Answer 3

np