4 - log3
4log3x
4x
± 9x
Correct answer is D
2log3y + log3x2 = 4
log3y2 + log3x2 = 4
∴ log3 (x2y2) = log381(correct all to base 4)
x2y2 = 81
∴ xy = ±9
∴ y = ±9x
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