We need to solve the exponential equation $6^{1-T} = 5^{3T+1}$ for the variable $T$.

AlgebraExponential EquationsLogarithmsEquation SolvingLogarithm Properties
2025/4/23

1. Problem Description

We need to solve the exponential equation 61T=53T+16^{1-T} = 5^{3T+1} for the variable TT.

2. Solution Steps

To solve the exponential equation 61T=53T+16^{1-T} = 5^{3T+1}, we can take the logarithm of both sides. We can use any base for the logarithm, but it's common to use the natural logarithm (base ee), denoted as lnln.
Taking the natural logarithm of both sides gives us:
ln(61T)=ln(53T+1)ln(6^{1-T}) = ln(5^{3T+1})
Using the logarithm power rule ln(ab)=bln(a)ln(a^b) = b \cdot ln(a), we have:
(1T)ln(6)=(3T+1)ln(5)(1-T) \cdot ln(6) = (3T+1) \cdot ln(5)
Now, we distribute the ln(6)ln(6) and ln(5)ln(5) on each side:
ln(6)Tln(6)=3Tln(5)+ln(5)ln(6) - T \cdot ln(6) = 3T \cdot ln(5) + ln(5)
Next, we want to isolate TT terms on one side of the equation and constant terms on the other side. So, we add Tln(6)T \cdot ln(6) to both sides and subtract ln(5)ln(5) from both sides:
ln(6)ln(5)=3Tln(5)+Tln(6)ln(6) - ln(5) = 3T \cdot ln(5) + T \cdot ln(6)
Now, we factor out TT from the right side:
ln(6)ln(5)=T(3ln(5)+ln(6))ln(6) - ln(5) = T(3ln(5) + ln(6))
Finally, we divide both sides by (3ln(5)+ln(6))(3ln(5) + ln(6)) to solve for TT:
T=ln(6)ln(5)3ln(5)+ln(6)T = \frac{ln(6) - ln(5)}{3ln(5) + ln(6)}
We can simplify the expression using logarithm properties. Specifically, aln(b)=ln(ba)a \cdot ln(b) = ln(b^a).
T=ln(6)ln(5)ln(53)+ln(6)T = \frac{ln(6) - ln(5)}{ln(5^3) + ln(6)}
T=ln(6)ln(5)ln(125)+ln(6)T = \frac{ln(6) - ln(5)}{ln(125) + ln(6)}
T=ln(6/5)ln(1256)T = \frac{ln(6/5)}{ln(125 \cdot 6)}
T=ln(6/5)ln(750)T = \frac{ln(6/5)}{ln(750)}
We can also approximate the value using a calculator:
ln(6)1.791759ln(6) \approx 1.791759
ln(5)1.609438ln(5) \approx 1.609438
3ln(5)4.8283143ln(5) \approx 4.828314
T1.7917591.6094384.828314+1.791759=0.1823216.6200730.02754T \approx \frac{1.791759 - 1.609438}{4.828314 + 1.791759} = \frac{0.182321}{6.620073} \approx 0.02754

3. Final Answer

T=ln(6)ln(5)3ln(5)+ln(6)=ln(6/5)ln(750)0.02754T = \frac{ln(6) - ln(5)}{3ln(5) + ln(6)} = \frac{ln(6/5)}{ln(750)} \approx 0.02754

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