2(1 + x)
2 + 3x
2(1 - x)
2 - 3x
Correct answer is D
log1012.5 = log10 121/2 = log1025/2 = log1025 - log102 = log1052 - log102 = 2log105 - log102 = 2log1010/2 - log102 = 2(1-x)- x = 2 - 2x – x = 2 – 3x
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