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4*2^(2x)-6^x=18*3^(2x)...

`4*2^(2x)-6^x=18*3^(2x)`

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`4*2^(2x) - 6^x = 18*3^(2x)`
Let `2^x = a and 3^x = b` `=> 4a^2-ab -18b^2 = 0`
`=>4a^2-9ab+8ab-18b^2 = 0`
`=>a(4a-9b)+2b(4a-9b) = 0`
`=>(a+2b)(4a-9b) = 0`
`=> a =-2b and a = 9/4b`
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