Answer
$-1*(5x-1)(x+4)$
Work Step by Step
$-5x^2-19x+4$
$-1*(5x^2+19x-4)$
Factors of -4: 1 and -4, 2 and -2, -1 and 4
$(5x+1)(x-4)$
$5x*x+5x*(-4)+1*x+1*(-4)$
$5x^2-20x+1x-4$
$5x^2-19x-4$ (right number, wrong sign on middle term)
$(5x-1)(x+4)$
$5x*x+5x*4+(-1)*x+4*(-1)$
$5x^2+20x-x-4$
$5x^2+19x-4$
$-1*(5x-1)(x+4)$
