Log(×+4)+log(×-4)=4log2+log15
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Answer:
log(x+4)+log(x-4) = log2^4 + log15
=> log[ (x+4)(x-4) ] = log( 16 *15)
=> (x+4)(x-4) = 16*15
=> x²-16=240
=> x² = 256
=> x = 16
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