Algebra: A Combined Approach (4th Edition)

$6a^{2}$ - $7ab$ - $5b^{2}$
Step 1: $(2a+b)(3a-5b)$ Step 2: $2a(3a-5b)$+$b(3a-5b)$ Step 3: $6a^{2}$ - $10ab+3ab$ - $5b^{2}$ Step 4: $6a^{2}$ - $7ab$ - $5b^{2}$