SOLUTION: Can someone help me! I keep getting two different answers to this problem (3a^3+4a^2-a-1)(a-5) My two answers are 3a^4-15a^3+4a^3-21a^2+4a+5 and 3a^4-11a^3-21a^2+4a+5 I wa

Question 253266: Can someone help me! I keep getting two different answers to this problem (3a^3+4a^2-a-1)(a-5) My two answers are 3a^4-15a^3+4a^3-21a^2+4a+5 and 3a^4-11a^3-21a^2+4a+5 I want to lean more towards the bottom answer but I've used the calulater to a problem and it gave me the top answer.
Found 3 solutions by jim_thompson5910, Greenfinch, JimboP1977:
Answer by jim_thompson5910(35256)   (Show Source): You can put this solution on YOUR website!
Start with the given expression.

Rearrange the terms.

Expand. Recall that

Distribute.

Multiply.

Now combine like terms.

So expands to .

In other words, .

As verification, you can graph the two expressions and you'll see that they are indeed the same graph.
Answer by Greenfinch(383)   (Show Source): You can put this solution on YOUR website!
I agree the second answer is right.
multiply by a and you get 3a^4 + 4a^3 - a^2 - a
multiply by (-5) and you get -15 a^3 - 20 a^2 + 5a + 5
giving 3a^4 + (4-15)a^3 -(20 + 1)a^2 + (5 - 1)a +5
Answer by JimboP1977(311)   (Show Source): You can put this solution on YOUR website!

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