anonymous
  • anonymous
If a = -7, what is 3-2(4+a)³ ?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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Nnesha
  • Nnesha
substitute a for -7
anonymous
  • anonymous
Yeah I did that
Nnesha
  • Nnesha
so what did you get ?

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anonymous
  • anonymous
Do I have to add what's inside the parenthesis when I substitute the -7 in ? @Nnesha
Nnesha
  • Nnesha
yes right PEMDAs rule first solve whats in the parentheses and then take cube
anonymous
  • anonymous
Kk
anonymous
  • anonymous
Okay so I did that and I got -3
Nnesha
  • Nnesha
is it 3-2 front of the parentheses ?
Nnesha
  • Nnesha
4-7=-3 (-3)^3 <--solve that
anonymous
  • anonymous
Wait no the 3-2 is not in the parenthesis its on the outside to the left
anonymous
  • anonymous
Okay so I solved -3³ and I got +27
anonymous
  • anonymous
@Nnesha
Nnesha
  • Nnesha
no don't forget the parentheses it's (-3)^3 not -3^3
anonymous
  • anonymous
Yeah the exponent
anonymous
  • anonymous
I already solved it
Nnesha
  • Nnesha
what did you get ?
anonymous
  • 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
Nnesha
  • Nnesha
no
Nnesha
  • 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
Nnesha
  • Nnesha
(-3)^3= -3 times -3 times -3 -3^3=-3 times 3 times 3 sign difference
madhu.mukherjee.946
  • madhu.mukherjee.946
i guess the answer is 57
madhu.mukherjee.946
  • madhu.mukherjee.946
coz 3-2(-3)^3 3-2(-27) 3+54 57
madhu.mukherjee.946
  • madhu.mukherjee.946
@Nnesha am i correct?
Nnesha
  • Nnesha
You already know.
anonymous
  • anonymous
Wait so I dont have to subract 3-2 ?
anonymous
  • anonymous
Wait never mind I got it !! :) thanks @Nnesha & @madhu.mukherjee.946
madhu.mukherjee.946
  • madhu.mukherjee.946
no
Nnesha
  • Nnesha
np
anonymous
  • anonymous
Can you help me with one more problem ?
madhu.mukherjee.946
  • madhu.mukherjee.946
say
anonymous
  • anonymous
@madhu.mukherjee.946 I'm done with math for today my brain hurts 😞 tomorrow I'll finish them
madhu.mukherjee.946
  • madhu.mukherjee.946
okay:)

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