Question 1017831
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4.   Completely factor each of the following expressions.
a.   12r – 3r2
     Answer:  3r*(4 - r)

b.   81 – n2
     Answer:  (9 + n)*(9 - n)

c.   x2 + 4x – 45
     Answer:  (x - 5)*(x + 9)

d.   4x2 + 24x + 36
     Answer:  {{{4*(x + 3)^2}}}

e.   3x2 + 5xy – 2y2
     Answer:  (3x - y)*(x + 2y)
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