Answer
$10x^{2}-29x-21$
Work Step by Step
Using FOIL method
$(5x+3)(2x-7)=5x\times2x+5x\times(-7)+3\times2x+3\times(-7)$
$=10x^{2}-35x+6x-21$
$Answer=10x^{2}-29x-21$
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