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(20^2 - 18^2) - (19^2 - 17^2)?
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12 Nov 2017, 00:31
12 Nov 2017, 00:31
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Question Stats:
100% (00:49) correct
0% (00:00) wrong based on 6 sessions
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\((20^2 - 18^2) - (19^2 - 17^2)\)?
A. 4
B. 36
C. 38
D. 76
E. 224
Kudos for correct solution.
A. 4
B. 36
C. 38
D. 76
E. 224
Kudos for correct solution.
Re: (20^2 - 18^2) - (19^2 - 17^2)?
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12 Nov 2017, 23:56
12 Nov 2017, 23:56
Using the formula for the difference of squares, we can rewrite the expression as \((20-18)(20+18) - (19-17)(19+17) = 2(20+18) - 2(19+17) = 2[(20+18)-(19+17)] = 2*2 = 4\).
Answer A
Answer A
gmatclubot
Re: (20^2 - 18^2) - (19^2 - 17^2)? [#permalink]
12 Nov 2017, 23:56
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