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Overview on multiplying binomials by foiling
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First Look at the problem
(2+3) (4-2) Remember the rules for multiplying negatives. Multiplying a positive and negative = negative Multiplying a negative and negative= positive Multiplying a positive and positive = positive
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Foiling F: First = multiply the two beginning numbers in each parenthesis with each other. O: Outer = multiply the first number in the first set of parenthesis with the last number in the last set. The outer numbers. I: Inner = Multiply the second number in the first set on parenthesis with the first number in the second set. The inner numbers. L: Last = Multiply the last numbers in both sets of parenthesis with each other.
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(2+3) (4-2) Multiply the first 2 numbers so 2x4=8.
F: First (2+3) (4-2) Multiply the first 2 numbers so 2x4=8.
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(2+3) (4-2) Multiply the two outer numbers 2x-2=-4 So far we have 8-4
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(2+3) (4-2) I: inner Multiply the two inner numbers 3x4=12
Since this is a positive 12, we put it in as a +12. So far we have
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(2+3) (4-2) L: Last Multiply the two last numbers together 3x-2=-6
So to finish our answer it would be: Then answer straight across and you should get: 10
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By: Mrs. Thompson
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