Answer
$25x^2-30x+9$
Work Step by Step
The square of a binomial sum is: $(A-B)^2=A^2-2AB+B^2$.
Hence here: $\frac{(5x-3)^6}{(5x-3)^4}=(5x-3)^{6-3}=(5x-3)^2=(5x)^2-2\cdot5x\cdot3+3^2=25x^2-30x+9$
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