Nicco C.

asked • 06/22/16

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

i cant solve any special products.i still cant get it on how to solve

Mark M.

"Solve" is a direction to determine the value of the variable that makes the equation true.
You do not have an equation. You present two expressions to be multiplied. You want to determine the product.
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06/22/16

1 Expert Answer

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David W. answered • 06/22/16

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Most "special products" have a generalized format which you must memorize and remember.
 
This one is:
   (a - b)(a + b) = a2 - b2
 
The way that is obtained is to use F-O-I-L (First-Outside-Inside-Last)
   (a - b)(a + b)
    a2 + ab - ba - b2
    a2 - b2
 
x2 - 9y2
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Nicco C.

lel i need the main answer not that..but btw tnx
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06/22/16

David W.

"Give a man a fish and you feed him for a day. Teach a man to fish and you feed him for a lifetime." -- Chinese Proverb
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06/22/16

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