How do you FOIL (7-a)^2 ?

1 Answer
Alan P.
May 28, 2015

(7-a)^2 = color(red)((7-a))*color(blue)((7-a))

F irst terms: color(red)(7) xx color(blue)(7) = 49
O utside terms: color(red)(7) xx color(blue)((-a)) = (-7a)
I nside terms: color(red)((-a)) xx color(blue)(7) = (-7a)
L ast terms: color(red)((-a)) xx color(blue)((-a)) = a^2

Sum of FOIL = 49 -14a+a^2

Related questions
See all questions in Multiplication of Polynomials by Binomials
Impact of this question
1579 views around the world
You can reuse this answer
Creative Commons License