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Answer : Option D
Explanation :
Hence the smallest number to be subtracted is 81 to make the number a perfect square.
Answer : Option B
∴ 3600 = 2 × 2 × 2 × 2 × 5 × 5 × 3 × 3
= 23 × 2 × 52 × 32
∴ 3600 must be multiplied by 60 to make it perfect cube.
From the above relation it is clear that
Answer : Option A
Multiplying the number by its conjugate:
Accoding to the question:
11 - 6 = a + b
a = 11, b = -6