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Question Number 17075 by tawa tawa last updated on 30/Jun/17
Giventhat:log(xy−z)=log(yz−x)=log(zx−y)Showthat:xx×yy×zz=1
Commented by RasheedSoomro last updated on 30/Jun/17
log(xy−z)=log(yz−x)=log(zx−y)⇒xy−z=yz−x=zx−y=x+y+zy−z+z−x+x−y=x+y+z0=∞???
Answered by 433 last updated on 30/Jun/17
xy−z>0&yz−x>0&zx−y>0x(y−z)>0&y(z−x)>0&z(x−y)>0xy−xz>0&yz−yx>0&zx−zy>0xy>xz&yz>yx&zx>zyxy>xz>zy>yxxy>yx
Answered by mrW1 last updated on 30/Jun/17
Thisquestioncannotbecorrect!iflog(xy−z)=log(yz−x)=log(zx−y)⇒xy−z=yz−x=zx−y=1alet′ssayx≠0,y≠0,z≠0,a≠0y−z=ax...(i)z−x=ay...(ii)x−y=az...(iii)0=a(x+y+z)⇒x+y+z=0y+z=−xy−z=ax⇒y=−1+a2x⇒z=−1−a2xputthisinto(ii)or(iii)x−−1+a2x=a−1−a2x(2+1−a)x=(−1−a)ax(3−a+a2+a)x=0a2+3=0!nosuchvalueforaispossible.thatmeansit′snottruethatlog(xy−z)=log(yz−x)=log(zx−y)
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