Answer
$$(4x+3)^2(y-20)(y+1)$$
Work Step by Step
We have $$y^2(4x+3)^2-19y(4x+3)^2-20(4x+3)^2$$
Factorizing $$(4x+3)^2(y^2-19y-20)$$ $$(4x+3)^2(y-20)(y+1)$$
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