Answer
$(6a-b)(9a+8b)$
Work Step by Step
$54a^2+39ab-8b^2$
Factors of -8: 1 and -8, 2 and -4, 4 and -2, 8 and -1
Factors of 54: 1 and 54, 2 and 27, 3 and 18, 6 and 9, -1 and -54, -2 and -27, -3 and -18, -6 and -9
$(6a-b)(9a+8b)$
$6a*9a+6a*8b+9a*-b+8b*-b$
$54a^2+48ab-9ab-8b^2$
$54a^2+39ab-8b^2$