What is $3m^8n * (-9mn^2)$ ?

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Answer 1 · 2017-01-24T20:46:21

$-27m^9n^3$

Break it into parts:
$3 * -9 = -27$
$m^8 * m^1 = m^(8+1) = m^9$
$n^1 * n^2 = n^(1+2) = n^3$

Then multiply all the parts together to get the answer.

What is 3m^8n * (-9mn^2)3m^8n * (-9mn^2)?