## anonymous one year ago If a = -7, what is 3-2(4+a)³ ?

1. Nnesha

substitute a for -7

2. anonymous

Yeah I did that

3. Nnesha

so what did you get ?

4. anonymous

Do I have to add what's inside the parenthesis when I substitute the -7 in ? @Nnesha

5. Nnesha

yes right PEMDAs rule first solve whats in the parentheses and then take cube

6. anonymous

Kk

7. anonymous

Okay so I did that and I got -3

8. Nnesha

is it 3-2 front of the parentheses ?

9. Nnesha

4-7=-3 (-3)^3 <--solve that

10. anonymous

Wait no the 3-2 is not in the parenthesis its on the outside to the left

11. anonymous

Okay so I solved -3³ and I got +27

12. anonymous

@Nnesha

13. Nnesha

no don't forget the parentheses it's (-3)^3 not -3^3

14. anonymous

Yeah the exponent

15. anonymous

16. Nnesha

what did you get ?

17. anonymous

I got 27 when I solved (-3³) then I subtracted 3-2 which was on the left so now I got 28 I'm not sure if its correct

18. Nnesha

no

19. Nnesha

$\huge\rm 3-2(4+a)^3$ substitute a for -7 $\huge\rm 3-2(4+(-7))^3$ $\huge\rm 3-2(-3)^3$ it is (-3) to the 3rd power not -(3^3) totally different

20. Nnesha

(-3)^3= -3 times -3 times -3 -3^3=-3 times 3 times 3 sign difference

i guess the answer is 57

coz 3-2(-3)^3 3-2(-27) 3+54 57

@Nnesha am i correct?

24. Nnesha

25. anonymous

Wait so I dont have to subract 3-2 ?

26. anonymous

Wait never mind I got it !! :) thanks @Nnesha & @madhu.mukherjee.946

no

28. Nnesha

np

29. anonymous

Can you help me with one more problem ?

say

31. anonymous

@madhu.mukherjee.946 I'm done with math for today my brain hurts 😞 tomorrow I'll finish them