anonymous
  • anonymous
(t-5)^2=81 do I take 5 from both sides or add it?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Neither
myininaya
  • myininaya
to get rid of the square, you must square root both sides
anonymous
  • anonymous
no what you do first is you hvae to square root both sides . only then you can add 5 to both sides. so t - 5 = - or + sqrt(81) so t - 5 = + or negative 9 so t - 5 = 9 and therefore t = 14 and t - 5 = -9 and therefore t = -4 so t = 14 and -4 are both valid answers

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anonymous
  • anonymous
I see how you got it now I guess with similar problems I thought I did the same thing to this one too. How would I do one with 1/2(x-1)^5=16
anonymous
  • anonymous
1/2(x-1)=16^(1/5)
myininaya
  • myininaya
first multiply by the reciprocal of 1/2 on both sides so you have grouping symbol by itself on one of the equation then you will have (x-1)^5=2*16
myininaya
  • myininaya
(x-1)^5=32
myininaya
  • myininaya
now since this is raised to the 5th power with take the 5th power of both sides giving us x-5=32^(1/5)
myininaya
  • myininaya
x-5=2
myininaya
  • myininaya
so x=2+5
myininaya
  • myininaya
x=7
anonymous
  • anonymous
how did you get 2
myininaya
  • myininaya
what is 32^(1/5)
myininaya
  • myininaya
since 32^(1/5)=[2*2*2*2*2]^(1/5)=2
anonymous
  • anonymous
got it when I put in calculator
anonymous
  • anonymous
is this right 3z^2 =48 z=16
myininaya
  • myininaya
z^2=48/3=16 so z=plus or minus 4
myininaya
  • myininaya
hey but what happens when you check x=7 in the question we did before this one
myininaya
  • myininaya
did you catch my mistake above?
myininaya
  • myininaya
it was suppose to be x-1=(32)^(1/5)
anonymous
  • anonymous
No I didn't but I was checking it
myininaya
  • myininaya
x-1=2
myininaya
  • myininaya
x=1+2=3
anonymous
  • anonymous
It is x-1+2=3 LOL
anonymous
  • anonymous
so it isn't 7
anonymous
  • anonymous
it is 3
myininaya
  • myininaya
so you got it good! i have to go eat. yes it is 3
anonymous
  • anonymous
thank you boy I could use your help all the time have a good supper

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