Solve the equation 5^x = 8, giving your answer to 3 significant figures.
Since there is an x written as a power here, it suggests that this question should be solved using logs (here assume I am using the natural logarithm, which has base e). Taking logs of both sides of the equation gives log5x = log8 Using the rule logab = bloga, the equation becomes xlog5 = log8 If we then divide the equation through by log5, we see that x = log8/log5 = 1.29
HM
Related Maths A Level answers
All answers ▸Differentiate y = 2xln(x)
Find the area enclosed by the curve y = cos(x) * e^x and the x-axis on the interval (-pi/2, pi/2)
Differentiate y=(x^2+5)^7
What are the advantages of using numerical integration (Trapezium rule, Simpson's rule and so on) over direct integration?