## bry856 one year ago simplifying algebraic expressions?

1. bry856

2. bry856

-a^2 - [-4a - (-15a^2 - 9a) ] - [1+(12a-1) ]

3. bry856

i know how to do problems like 7b^2-b+3b+6-3b^2+5+2b^2+7b but i get confused when parentheses and brackets are added

4. anonymous

ok

5. Nnesha

PEMDAS rule $\large\rm -a^2 - [-4a - (-15a^2 - 9a) ] - [\color{reD}{1+(12a-1) }]$ first of solve red part there is a plus sign so u can remove that parentheses and then combine like terms $\large\rm -a^2 - [-4a - (-15a^2 - 9a) ] - [\color{reD}{1+12a-1 }]$

6. anonymous

do you want the answer because i have the answer and she is correct

7. bry856

yes please haha and thank you^^

8. anonymous

97a^2-12a

9. bry856

Nnesha, do you do that for both sides

10. Nnesha

new to open study? we are not allowed to give DIRECT Answer :-) http://openstudy.com/code-of-conduct

11. bry856

dang i typed that in and it said it was wrong

12. anonymous

ik but i cant explain it it just clicks then i skip a couple steps

13. anonymous

^ is it is squared by 2

14. Nnesha

both sides ? if you mean other bracket then first you have to distribute parentheses by negative one $\large\rm -a^2 - [-4a\color{blue}{ - (-15a^2 - 9a)} ] - [\color{reD}{1+12a-1 }]$ -1(-15a^2 -9a) and then combine like terms so -1(-15a^2 -9a ) = ??

15. anonymous

carp i thought i put a negative 97 its post to be -97a^2-12a

16. Nnesha

do you know how to distribute ?

17. bry856

kinda

18. Nnesha

alright distribute = multiply everything which is inside the parentheses by outside term so -1(-15a^2 -9a) multiply -1 times -15a^2 = ?? -1 times -9a = ??

19. Nnesha

and btw that answer is not correct :( js