Answer:
\[{{y}^{2}}-2y-15\] \[{{y}^{2}}-\left( 5-3 \right)y-15\] \[{{y}^{2}}-5y+3y-15\] \[y\left( y-5 \right)+3\left( y-5 \right)\] \[\left( y-5 \right)\left( y+3 \right)\]
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