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  1. If a = 23 and b = –29 then the value of 25a2 + 40ab + 16b2 is :
    1. 1
    2. –1
    3. 0
    4. 2
Correct Option: A

25a2 + 40ab + 16b2
= (5a + 4b)2
= (5 × 23 – 29 × 4)2
= (115 – 116)2 = 1


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