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" 15.If "2^(x).3^(x+4)=7^(x)," then "x=...

" 15.If "2^(x).3^(x+4)=7^(x)," then "x=

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If 2^(x)*3^(x+4)=7^(x), then x is equal to (A) (4log3)/(log7-log6)(B)(4log3)/(log6-log7)(C)(2log3)/(log7-log6)(D) none of these

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The value of f(x)=x^4+4x^3+2x^2-4x+7, when x=cot((11pi)/8) is _________