Question 165482
FOIL means First Outer Inner Last
Think of it like this (a+b)(c+d)=first(a*c)+outer(a*d)+inner(b*c)+last(b*d)
for your problem:
a=3x
b=-8
c=x
d=-7
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If you substitute your numbers into the above equation then you will have your answer.
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If you need additional help just contact me @ justin.sheppard.tech@hotmail.com
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hopefully this helps