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Question

If a + b = 8 and a - b = 2, then the value of 2a2 + 2b2 is


A

68

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B

70

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C

60

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D

58

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Solution

The correct option is A

68


2(a2 + b2)
= (a + b)2 + (a - b)2
= 82 + 22 = 68


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