Answer:
c ) [tex]10x^{3} + 28x^{2} -12x -18[/tex]
Step-by-step explanation:
[tex](5x^{2} -x-3)(2x+6)[/tex]
we apply distributive property:
[tex]5x^{2} *2x + 5x^{2} *6 - x*2x - x*6 - 3*2x - 3*6\\\\10x^{3} +30x^{2} -2x^{2} -6x -6x -18\\\\10x^{3} + 28x^{2} -12x -18[/tex]
