Level of difficulty E M
There is only one pair of positive integers whose difference of squares is equal to seven. Since we know a
is larger than b
(because the difference is positive), it doesn't take more than a few tries to determine that a
= 4 and b
= 3. Since a
= 4, the answer is choice B.
For more practice with similar problems, go to Skill Set 27: Odd/Even Numbers.
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