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  1. If a + b = 17 and a – b = 9, then the value of (4a2 + 4b2) is :
    1. 710
    2. 720
    3. 730
    4. 740
Correct Option: D

a + b = 17
a – b = 9
∴  (a + b)2 + (a – b)2 = 172 + 92
⇒  2 (a2 + b2) = 289 + 81 = 370
⇒  4 (a2 + b2) = 2 × 370 = 740


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