Is the products of two irrational number always on irrational number?

Atriangular bandana has an area of 46 square inches. the height of the triangle is 5 3 4 inches. enter and solve an equation to find the length of the base of the triangle. use b to represent the length of the base.

Enter the number of complex zeros for the polynomial function f(x) = x 4+ 5x² +6

Can someone me out here number 4 plz