\(350^2-320^2=\)
A) \(900\)
B) \(8100\)
C) \(21100\)
D) \(21000\)
E) \(20100\)
Answer: E
Source: Manhattan GMAT
\(350^2-320^2=\)
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Solution:
Note that 350^2 - 320^2 is a difference of squares, so it can be re-expressed as:
(350 - 320)(350 + 320)
30 x 670
20100
Answer: E
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