Answer
a
Work Step by Step
$(5x+1)(x+12)$
$5x*x+5x*12+1*x+1*12$
$5x^2+60x+x+12$
$5x^2+61x+12$
$(5x+3)(x+4)$
$5x*x+5x*4+3*x+3*4$
$5x^2+20x+15x+12$
$5x^2+35x+12$
$(5x+2)(x+6)$
$5x*x+5x*6+2*x+2*6$
$5x^2+30x+2x+12$
$5x^2+32x+12$
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