2 log(x + a) = log(16a^6) where a is a positive constant. How do I find x in terms of a?

The left hand side of the equation can be rewritten as log(x+a)^2, using the power rule for logs. We can then simplify log(x+a)^2=log(16a^6) to (x+a)^2=16a^6. Taking the square root of both sides, we find x+a=4a^3. Finally, we can rearrange to find x=4a^3-a.

EV

Related Maths A Level answers

All answers ▸

Below is a question from the Edexcel Maths Core 1 textbook, Solve the equation x^2 + 8x + 10 = 0 using completing the square.


Separate (9x^2 + 8x + 10)/(x^2 + 1)(x + 2) into partial fractions.


Differentiate sin(x)cos(x) using the product rule.


How to integrate and differentiate ((3/x^2)+4x^5+3)