Question

PLSSSS HELPPP 18 POINTS MATHHH PLSSS HELPPP

Answer 1

`81x^(8)`

Explanation:

I gotchu again, papiii!! :D

This is an easy one too! Theres a couple rules you should be familair with:

A positive multiplied by a positive is a positive.
A positive multiplied by a negative is a negative.
A negative multiplied by a negative is a positive.

Furthermore, when you have a problem in this form, you MULTIPLY the coefficients and ADD the exponents. So, -9 * -9 = POSITIVE 81, and
`x^(5+3)=x^8`. Therefore, the answer is
`81x^(8)`

Answer 2

`\sf \bf 81x^8`

Explanation:

Exponent rule:

In exponent multiplication, if bases are same, add the exponents.

`\sf \bf a^m*a^n = a^(m+n)`

`\sf (-9x^5)(-9x^3) = (-9)*(-9) * x^(5+3)`

`\sf = 81x^8`