Someone give the answer for the following, we need to write an expression for the following

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

The parabola opens: y=√x-4 (principal square root) up down right left

Kim states, "if the diagonals of a parallelogram form right angles, then the parallelogram is a rectangle." decide if her statement is true or false.