Question

Multiply.................

Answer 1

For this case we must solve the following product:

$-7a ^ 2 (3a ^ 3-4a ^ 5)$

We know that, by definition, the distributive property states that:

$a (b + c) = ab + ac$

Also, by definition, we know that:

$x ^ n * x ^ m = x ^ {m + n}$

On the other hand, we have to:

$+ * - = -\\- * - = +$

So:

Resolving, multiplying term by term, taking into account the previous definitions, we have:

$-7a ^ 2 (3a ^ 3-4a ^ 5) = - 21a ^ 5 + 28a ^ 7$

Answer:

option b

Answer 2

It’s B.
Distribute the 7a and multiply it with the 3a and -4 a. With the exponents you add them.