Answer
$(3x-5)(2x+3)$
Work Step by Step
Use $-x=9x-10x$
$6x^2-x-15=6x^2+9x-10x-15=(3x)2x+(3x)3+(-5)2x+(-5)3=3x(2x+3)+(-5)(2x+3)=(3x-5)(2x+3)$
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