Answers>Maths>IB>Article

Find integer solutions for m - n(log3(2)) = 10(log9(6)).

From the properties of logarithms (logba = logca / logcb), 10log96 can be rewritten as 10(log36 / log39). Since log39 = 2, 10log96 = 5log36. We then bring both log terms to the same side of the equation: m = 5log36 + nlog32. Again, from log properties (a(logcb) = logcba), this can be rewritten as m = log365 + log32n. Since the logarithms have the same base, we can combine them using another log property (logab + logac = logabc). This yields m = log3652n. We can factor out the 25 from the 65 to obtain m = log335252n. Combining the 2s: m = log33525 + n. We then raise 3 to the power of both sides to get an equation without logarithms: 3m = 3525 + n. We can write an invisible 20 term on the left side without changing the equation, giving 3m20 = 3525 + n. Since m and n are integers, m = 5 and 5 + n = 0, meaning n = -5. So the solution is m = 5, n = -5.

TK

Related Maths IB answers

All answers ▸

What is proof by induction and how do I employ it?


In a lottery, 6 numbered balls are drawn from a pool of 59. Calculate the probability of scoring a jackpot. There used to be 49 balls in the pool. Calculate by how much the addition of 10 balls has decreased the probability of scoring a jackpot


Solve the equation sec^2 x + 2tanx = 0 , 0 ≤ x ≤ 2π, question from HL Maths exam May 2017 TZ1 P1


Write down the expansion of (cosx + isinx)^3. Hence, by using De Moivre's theorem, find cos3x in terms of powers of cosx.