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Question 723120: Question: 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
Note: It says use the "FOIL" for problems 14-18. But Im not sure how to do that! Help please? Thank you so much!
Answer by Alan3354(69443)   (Show Source):
You can put this solution on YOUR website! 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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