## anonymous 5 years ago how to find the domain

1. anonymous

$y=\sqrt{3x+4}$

2. anonymous

you can't have a square of a negative number so 3x + 4 must be greater than or equal to zero so your domain is $3x + 4 \ge 0$ $x \ge -\frac{4}{3}$

3. anonymous

4. anonymous

awesome ^_^

5. anonymous

Factor 5z(2z+1)-2(2z+1)

6. anonymous

OH I SEE IT NOW ignore my other anwer it's (2z + 1)(5z -2)

7. anonymous

can you help me with my other problems ,

8. anonymous

won't know till you tell me the questions

9. anonymous

Factor x2 + 9x + 20

10. anonymous

can yu help with the steps

11. anonymous

okay so you need two numbers that multiply to 20 and add up to 9 the numbers at multiply to 20 are 2,10 1,20 and 4,5 only 4 and 5 add up to 9 so it's 4 and 5 so (x + 4)(x + 5)

12. anonymous

4a2+a-3 so we need two numbers that can muliply by a-3 right ?

13. anonymous

no, this one is different, because there's a 4 in front of the a squared.

14. anonymous

I'm going to try to explain this...so bear with me.... :x so your answer is going to be something like this with numbers in place of the _ (_a + _)(_a + -)

15. anonymous

Correction : (_a + _)(_a + _)

16. anonymous

sigh..this is hard over the internet...

17. anonymous

i know

18. anonymous

go to this site http://tutorial.math.lamar.edu/Classes/Alg/Factoring.aspx it's really helpful i'm sorry that i can't explain this. but read over the site. it explains it quite well. tell me how it goes go to example 3 part e

19. anonymous

thanks : )