Solve 4log₂(2)+log₂(x)=3

First, we should look at the laws of logarithms.logax+logay=logaxylogax-logay=loga(x/y)klogax=logaxkWe can see that laws 1 and 3 might be helpful, so we simplify our equation.log224 +log2x=3log224x=3log216x=3Next, we just have to rearrange for x. The inverse of a logarithm is an exponential, so put each side of the equation as a power of 2 (as this is the base of the logarithm). This allows us to remove the logarithm and exponential from one side and we just have to divide by 16 after this.2log16x=2316x=8x=1/2

Related Maths A Level answers

All answers ▸

Consider a differential equation where dx/dt = -axt. Find an equation for x(t).


We have the curve f(x) = (x^2-5x)(x-1)+ 3x. Sketch the graph y=f(x), making sure to plot the co-ordinates where the curve meets the axes.


Let N be an integer not divisible by 3. Prove N^2 = 3a + 1, where a is an integer


Find the equation of the normal to the curve y=2x^3 at the point on the curve where x=2. Write in the form of ax+by=c.


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo
Cookie Preferences