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Question 1 (Multiple Choice Worth 1 points) Find the product of (x − 5)2. x2 + 10x + 25 x2 − 10x + 25 x2 − 25 x2 + 25 Question 2 (Multiple Choice Worth 1 points) Find the product of (x + 7)2. x2 − 14x + 49 x2 + 14x + 49 x2 − 49 x2 + 49 Question 3 (Multiple Choice Worth 1 points) Find the product of (2x + 5y)(2x − 5y). 4x2 − 20xy + 25y2 4x2 + 20xy + 25y2 4x2 + 25y2 4x2 − 25y2 Question 4 (Multiple Choice Worth 1 points) Find the product of (3x − 7y)2. 9x2 − 42xy + 49y2 9x2 + 42xy + 49y2 9x2 − 49y2 9x2 + 49y2 Question 5 (Multiple Choice Worth 1 points) Find the product of (x + 5)(x − 5). x2 − 10x + 25 x2 + 10x + 25 x2 − 25 x2 + 25 Question 6 (Multiple Choice Worth 1 points) The product of (a − b)(a − b) is a2 − b2. Sometimes Always Never Question 7 (Multiple Choice Worth 1 points) Find the product of (4x + 3y)2. 16x2 − 24x + 9y2 16x2 + 24xy + 9y2 16x2 − 9y2 16x2 + 9y2
1) A 2) D 3) D 4) B 5) C 6) C 7) B
so @DebbieG are my answers right?
Hold on, I had to open in a new window so I can look at the questions and answers together, give me a sec...
1) A NO, check the sign that you should get on the middle term. (Look at the OI in the FOIL!) 2) D NO, where did the middle term of the FOIL disappear to? The middle term ONLY goes away on these types of products when it is that special one that we talked about - the product of a sum and a difference gives you a DIFFERENCE of squares. You won't get a SUM of squares from a product of two binomials. 3) D YES!! (THIS is a product of a sum & diff, so you get a diff of squares!) 4) B NO, again, check the sign on that middle term. Look at your OI products - what signs do they have, what do they add to?? 5) C YES! Another diff of squares. 6) C Right! THIS won't give you a diff of squares. 7) B YES!
1) B 2) C 4) A
1) B - right! 2) C - stilll no 4) A - right!
hmmmm sure, cool story bro @gree420
\((x + 7)^2=(x + 7)(x + 7)\) Now FOIL that out, one term at a time, like you did before....
Let's work the problem out... I want to make sure you aren't guessing now. :)
@gree420 if you have a problem that you want help with, just post your own question. Someone will help you! :) I'm working with @JOshua_Lewis here. Let's not confuse this thread.
i wasn't guessing... i realized what was wrong right when you said something.
i feel like my first answer is right
lol ok, well, yes B is right..... \((x + 7)^2=(x + 7)(x + 7)=x^2+7x+7x+7^2=x^2+14x+49\) Just be careful with the signs on those 2 middle terms, and make sure you add them correctly. That seems to be the place where you end up making errors. but you're getting it - just keep practicing! Do more and more of them! This should get very easy, then it will be easier for you when you get to factoring them, and on to more complex topics. You will need to be multiplying polynomials like this for as long as you take math! :)
What do you mean? Your first answer where, to what?
ohhh!!!!........ _-_ i feel dumb lol
lolol well thanks again :)
You're welcome! happy to help. :)