<PRE><B>Question 723120</B>
Write each of the following as a polynomial in descending powers of its variable.
 13 9x(x + 2) My answer: 9x^2+18
 14 (9x + 1)(x + 2)
 15 (x – 7)(x + 9)
 16 (x - 5)(x + 5)
 17 (4x – 1)2
 18 (x3 + x)2 
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 13 9x(x + 2) My answer: 9x^2+18 *** = 9x^2 + 18x
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 14 (9x + 1)(x + 2)
FOIL is First, Outside, Inside, Last
= 9x^2 + 18x + x + 2
= 9x^2 + 19x + 2
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15 (x – 7)(x + 9)
= x^2 + 2x - 63
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You do the rest.  email via the Thank You note for help or to check your work.
 16 (x - 5)(x + 5)
 17 (4x – 1^)2
 18 (x3 + x^)2 
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