Answer:
Assuming you wanted [tex]-4b^2 * -5b^7[/tex] and not [tex](-4b)^2 *(-5b)^7[/tex], your answer is
[tex]20b^9[/tex]
Step-by-step explanation:
[tex]-4b^2 * -5b^7[/tex]
^^ We can simplify this expression by multiplying [tex]b^2[/tex] and [tex]b^7[/tex] (Add the powers of like-terms).
[tex]b^9 *(-4)*(-5)[/tex]
Multiply it out
[tex]20b^9[/tex]
