Discussion
By factorizing 54x - 45y, answer must be
Answer: A
Both terms share a factor of 9.
\[ 54x - 45y = 9 \times 6x - 9 \times 5y = 9(6x - 5y) \]
9 is the highest common factor of 54 and 45; taking out 3 alone would leave \( 3(18x - 15y) \), which is not fully factorised.
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