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Examples and practice with formula

What does "FOIL" stand for ?

question
Video Multiplying Binomials
Visualizing with Rectangles and Area

What is the area of the rectangle below?

Answer
The area of each part of the rectangle can be seen as a 'part' of the FOIL formula
Foil as area of rectangles
Example 1


Let's multiply the following binomials:
(X + 3 )( X + 2)
Step 1) Multiply the first, outer, inner and last pairs Picture of Foil Method
Show Step 1
Step 2) Simplify by adding the terms
Show Step 2
Example 2


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Practice Problems


Problem 1) Multiply the 2 binomials below:
$$(k + 7 )( k - 4) $$
Step 1


Problem 2) Multiply the following binomials:
$$(k - 3 )( k - 5) $$
Step 1


Problem 3) Multiply the binomials:
$$ (2k + 9)(3k - 4) $$
Step 1


Problem 4) Multiply the 2 binomial :below :
$$ (5k - 1 )(2k + 3) $$
Step 1
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Practice Problems