Question
Factor polynomial $$ r^{2}-100 $$
Answer
$$ r^{2}-100 = ( r-10 )( r+10 ) $$
Explanation
Rewrite $ r^{2}-100 $ as:
$$ r^{2}-100 = (r)^2 - (10)^2 $$Now we can apply the difference of squares formula.
$$ I^2 - II^2 = (I - II)(I + II) $$After putting $ I = r $ and $ II = 10 $ , we have:
$$ r^{2}-100 = (r)^2 - (10)^2 = ( r-10 ) ( r+10 ) $$This page was created using
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