McGraw Hill Integrated II, 2012
MH
McGraw Hill Integrated II, 2012 View details
4. Special Products
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Exercise 23 Page 31

b^2-49

Practice makes perfect
Notice that the given expression is the multiplication of conjugates. This allows us to use a shorter method of multiplying the terms than the normal distribution process.
(b+7)(b-7)
b^2-7^2
b^2-49