klairethoman klairethoman
  • 20-02-2017
  • Mathematics
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2logbT - logb 2 = logb(2t + 6)

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apologiabiology
apologiabiology apologiabiology
  • 20-02-2017
assuming T=t

reemmber
alogb=log(b^a)
and loga-logb=log(a/b)
and [tex]a^{log_a(b)}=b[/tex]


[tex]2log_b(t)-log_b(2)=log_b(2t+6)[/tex]
[tex]log_b(t^2)-log_b(2)=log_b(2t+6)[/tex]
[tex]log_b( \frac{t^2}{2})=log_b(2t+6) [/tex]
raise both sides to the b power
[tex] \frac{t^2}{2} =2t+6[/tex]
times 2 both sides
t²=4t+12
t²-4t-12=0
(t-6)(t+2)=0
t=-2 or 6
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