Posted by Lea on Thursday, March 7, 2013 at 6:07pm.
You can multiply these binomials like any other.
x times x and x times 7
then -7 times x and - 7 times 7
x^2 + 7x - 7x -49
x^2 -49
Or you can recognize this pair as a sum and difference which always multiplies to be the difference of two squares.
(a+b)(a-b) = a^2 -b^2
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