## anonymous 5 years ago 7u^2-28m^2 factor the polynomial

1. anonymous

$7(u ^{2}-4m ^{2})$ $7(u+2m)(u-2m)$

2. anonymous

do you understand how to do these type of problems?

3. anonymous

yes im just checking the problems to see if people come up with the same answer as me or something different

4. anonymous

ok, do you have any more?

5. anonymous

i have 7 more

6. anonymous

7. anonymous

ok thank you this is the last thats factoring out the rest are solving the equations 16c^2+72cd+81d^2

8. anonymous

this might go faster if you tell me what you got for the answer and i'll check to make sure it's correct

9. anonymous

this one im thinking is prime

10. anonymous

which number do you think is prime?

11. anonymous

im thinking the polynomial is prime like the whole thing in other words it cant be factored down into a product of 2 binomials

12. anonymous

yes. first you should reorder the polynomial so it looks like this:$72cd+16c ^{2}+81d ^{2}$ then factor $(4c+9d)(4c+9d)$ $(4c+9d)^{2}$

13. anonymous

50b^2+20b+2=0 im thinking the solution to this is 1/5 -1/5

14. anonymous

how did you get the positive 1/5?

15. anonymous

i got the negative one first and the teacher said if the negative works then the positive will work as well and the other way around

16. anonymous

that's only the case when the variaable is squared or has a even number power. try plugging in the positive 1/5 in to the equation. does it come out to equal 0?

17. anonymous

no so it would be -1/5 and what would the other solution be then if its not positive 1/5

18. anonymous

-(1/5) is the only answer. the polynomial should look like this :$2(25b ^{2}+10b+1)=0$$2(5b+1)(5b+1)=0$$5b+1=0$$b=-{\frac{1}{5}}$

19. anonymous

sorry my computer is being tarded the next one is g^2+2/3g+1/9=0

20. anonymous

$g=-{\frac{1}{3}}$

21. anonymous

okk thanks thats all i needed for now youve been helpful thank you