SOLUTION: I forget the formula that applies to this problem (3a-1)^2 Do I multiple 3*2=9would I write the problem as 9a^2 +1?

Question 253109: I forget the formula that applies to this problem (3a-1)^2 Do I multiple 3*2=9would I write the problem as 9a^2 +1?
Found 2 solutions by palanisamy, jim_thompson5910:
Answer by palanisamy(496) (Show Source): You can put this solution on YOUR website!
You have to apply the formula, (a-b)^2 = a^2+b^2-2ab
(3a-1)^2 = (3a)^2+(1)^1-2(3a)*1
=9a^2+1-6a
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!

Start with the given expression.

Expand. Remember something like .

Now let's FOIL the expression.

Remember, when you FOIL an expression, you follow this procedure:

Multiply the First terms:.

Multiply the Outer terms:.

Multiply the Inner terms:.

Multiply the Last terms:.

---------------------------------------------------
So we have the terms: , , ,

Now add every term listed above to make a single expression.

Now combine like terms.

So FOILs to .

In other words, .

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