Help I cant figure this out due by tuesday night. 

1. Factor completely:

x5y3 – 3x4y2 – 28x3y

Take out x3y

x3y(x2y2 - 3xy - 28)

Factor the trinomial in parentheses:

x3y(xy - 7)(xy + 4)

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2.  Factor completely:
x3 – 2x2 + 6x – 12

Take x2 out of the first two terms only

x2(x - 2) + 6x - 12

Take + 6 out of the last two terms only

x2(x - 2) + 6(x - 2)

Take out (x - 2)

(x - 2)(x2 + 6)

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3.  Factor completely:
x2 + 17x + 16

(x + 16)(x + 1)

4.  Factor completely:
3x2 – 75y2

Take out 3

3(x2 - 25y2)

3(x - 5y)(x + 5y)

Do you understand where any of this came from?

Edwin