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प्रश्न
Which of the following should be added to make x4 + 64 a perfect square
विकल्प
4x2
16x2
8x2
– 8x2
उत्तर
16x2
Explanation;
Hint:
x4 + 64 = (x2)2 + 82 + 2 × 8x2
= (x2 + 8)2
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