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Mathematics 8 Online
OpenStudy (anonymous):

Help me Solve? Again?

OpenStudy (anonymous):

\[7^{x-5}=7^{4x+7}\]

OpenStudy (gorv):

x-5=4x-7 3x=2 x=2/3

OpenStudy (anonymous):

A. x=-4

OpenStudy (anonymous):

\[B. x=-\frac{ 12 }{ 5 }\]

OpenStudy (anonymous):

\[C. x=\frac{ 2 }{ 3 }\]

OpenStudy (gorv):

sry x-5=4x+7 3x =-12 x=-4

OpenStudy (anonymous):

I was thinking it was A :) thanks

OpenStudy (gorv):

x=-4 is correct welcome:)

OpenStudy (anonymous):

Can you help me with another one?

OpenStudy (anonymous):

\[Solve. 64^{x}=16^{x-1}\]

OpenStudy (anonymous):

A. x=-2

OpenStudy (anonymous):

B. x=-1

OpenStudy (gorv):

64=4^3 16=4^2 4^3x=4^2(x-1) 3x=2x-1 x=-1

OpenStudy (gorv):

plz click best response if u understood

OpenStudy (anonymous):

You're amazing! :D

OpenStudy (anonymous):

I did :) But-1 is not the answer... I think x=-1/3

OpenStudy (gorv):

sry mate

OpenStudy (gorv):

3x=2(x-1) x=2 it is right check this

OpenStudy (anonymous):

It's all good :) thank you for your help!

OpenStudy (gorv):

@P.nut1996 x=2 is correct 100 % sure

OpenStudy (anonymous):

Thanks :)

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