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Mathematics 10 Online
iosangel:

solve for x 3^7x=81^x+9

iosangel:

|dw:1636226306930:dw|

iosangel:

Can i use log to solve this

Nnesha:

yes

surjithayer:

any idea?

surjithayer:

no,need to take log. \[3^{7x}=81^{x+9}\] \[3^{7x}=(3^4)^{(x+9)}\] \[3^{7x}=3^{4(x+9)}\] \[3^{7x}=3^{(4x+36)}\] 7x=4x+36 x=?

iosangel:

12

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