what is the product. ( x-9)(x+8)
Find the product. (X-9)(x+8)
2 Answers By Expert Tutors
Mathematics professor at Community Colleges
( x -9)( X+ 8) =
( X - 9 ) X + 8 ( X - 9) = Distribute it twice
X2 - 9X + 8X - 72 =
X2 - X - 72
Generally : ( X + a ) ( X + b ) = X2 + ( a + b ) X + ab
My goal is the success of my students. Knowledge-Patience-Honesty
Using FOIL (First, Outside, Inside, Last):
First: x(x) = x2
Outside: x(8) = 8x
Inside: -9(x) = -9x
Last: -9(8) = -72
x2 + 8x - 9x - 72
x2 - x - 72
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