Q. Given the substitutions ln2=a,ln3=b, and ln5=c, find the value of ln(813e) in terms of a,b, and c.Answer:
Simplify Expression: We need to express ln(813e) in terms of a, b, and c. First, let's simplify the expression inside the logarithm. The cube root of e is e1/3, and 81 can be written as 34.So, ln(813e) becomes ln(34⋅e1/3).
Apply Logarithm Properties: Now, we apply the properties of logarithms to separate the terms. The logarithm of a product is the sum of the logarithms, so ln(34⋅e1/3) becomes ln(34)+ln(e1/3).
Apply Power Rule: Next, we apply the power rule of logarithms, which states that ln(xy)=y⋅ln(x). This gives us 4⋅ln(3)+(31)⋅ln(e).
Substitute Given Values: Since ln(e) is equal to 1, the expression simplifies to 4×ln(3)+(31)×1, which is 4×ln(3)+31.
Final Expression: Now, we substitute the given values for ln(2), ln(3), and ln(5). Since ln(3)=b, we replace ln(3) with b in our expression. This gives us 4×b+31.
Final Expression: Now, we substitute the given values for ln(2), ln(3), and ln(5). Since ln(3)=b, we replace ln(3) with b in our expression. This gives us 4⋅b+31.The final expression is 4b+31. This is the value of ln(813(e)) in terms of a, b, and ln(3)1, although a and ln(3)1 do not appear in the final expression.