hrcheerlove Multiply the polynomials: 1. (a + 3)(a - 2) 2. (x2 + 4)(x2 - 4) 3. (x2 + 3x + 1)(x2 + x + 2) one year ago one year ago

1. Outkast3r09

use the distributive property $a(b\pm c)=ab\pm ac$

2. Outkast3r09

using this you take the first variable of the first and multiply it by the second parenthesis and same with the second variable/constant of the first $a(a-2)+3(a-2)$

3. Outkast3r09

what do you get when yo udo this?

4. hrcheerlove

So then i got: 2a-2a + 3a-6

5. hrcheerlove

But I dont think that is right lol

6. hrcheerlove

@Outkast3r09

7. Outkast3r09

everything but your first multiplication is correct $a(a)\neq 2a$

8. Outkast3r09

hint: when you have a number to a power you get this correct $2^2=2*2$

9. Outkast3r09

so $a*a=?$

10. hrcheerlove

uhhh 2 squared ???

11. hrcheerlove

@Outkast3r09

12. Outkast3r09

not quite so 2 is the base

13. Outkast3r09

in $2^2$

14. Outkast3r09

the power tells you how many times you multiply that base by itself

15. Outkast3r09

so $2^3=2*2*2$ $2^5=2*2*2*2*2$

16. Outkast3r09

so in your case $a*a$ a is your base and the number of bases you multiply is your power

17. Outkast3r09

so $a*a=a^2$

18. hrcheerlove

I know how to do powers lol. I just dont know what $a \times a$ is

19. hrcheerlove

oh okay lol

20. some_someone

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21. Outkast3r09

I think it's just the variable thats giving you a tough time if it helps let a be whatever you want and then replace it back with a. For example i have $a*a*a*a$ in your head think a=5 $5*5*5*5=5^4$ replace 5 with a

22. some_someone

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23. Outkast3r09

some someone let her do the last one

24. hrcheerlove

so would it be $a ^{2}-5a -6$ ?

25. Outkast3r09

$-2a+3a$ if you have 3 dollars and lost 2 dollars, how many do you have now =]

26. hrcheerlove

lol 1 dollar

27. some_someone

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28. some_someone

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29. hrcheerlove

Thank you thank you thank you @Outkast3r09 and @some_someone !!!!

30. some_someone