The GCF is always = to 0r less than the smallest coefficient:
GCF =< 5.
When a variable is involved, choose the
common variable of lowest degree(smallest exponent). All of this has been properly done.
Perform the multiplication; the product
should be identical to the expression
that was given.
5a^8 + 5a^7 - 25a^7 -25a^6 =
5a^8 - 20a^7 - 25a^6.
Your answer is correct!
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