How many zeros are in -5x(x-3)(x^2-16)

Count the number of times x is used as a factor of this polynomial.  I count 4.  Thus, this expression will have 4 zeros.

This is a fourth degree polynomial, so by the fundamental theorem of algebra, there are four zeroes, whether they are complex or real.

The expression can be rational factorized into
-5x(x-3)(x+4)(x-4), so all four factors (hence zeroes) are real.

There are four real zeroes in -5x(x-3)(x^2-16)

The actual height of the building = 36 feet.

Step-by-step explanation:

By blue print conversion,

2 inches = 8 feet

Therefore, 1 inch = = 4 feet

1 inch = 4 feet

The height of the building on the  blueprint = 9 inches

The actual height of the building = 9 * 4 = 36 feet.