For this case we must solve the following product:
[tex]-7a ^ 2 (3a ^ 3-4a ^ 5)[/tex]
We know that, by definition, the distributive property states that:
[tex]a (b + c) = ab + ac[/tex]
Also, by definition, we know that:
[tex]x ^ n * x ^ m = x ^ {m + n}[/tex]
On the other hand, we have to:
[tex]+ * - = -\\- * - = +[/tex]
So:
Resolving, multiplying term by term, taking into account the previous definitions, we have:
[tex]-7a ^ 2 (3a ^ 3-4a ^ 5) = - 21a ^ 5 + 28a ^ 7[/tex]
Answer:
option b
