Lesson: Multiplication of radical expressions

=3 – 4 = -1. I could have used the short cute here. The short cut is first term squared minus second term squared = = 3 – 4 =-1. The long way tells me to F.O.I.L = = = The short way tells me first term squared + twice the product + second term squared = = = If we recognize that these are conjugates we can apply the short cut = =4(5) – 3 ... ................
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