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Maths
A Level

Solving a quadratic with ax^2 e.g. 2x^2 - 11x + 12 = 0

To solve the equation in the form (ax + b)(x + c):

Method 1

  1. Rewrite the x term as the sum of 2 different x terms. Start by multiplying the x^2 term and the final number term...

Answered by Andrea W. Maths tutor
5728 Views

Shower-cleaner liquid is sold in spray bottles. The volume of liquid in a bottle may be modelled by a normal distribution with mean 955 ml and a standard deviation of 5 ml. Determine the probability that the volume in a particular bottle is:

a) at most 960 ml

Let X be the volume of liquid in a particular bottle, then we want to find P(X <= 960). We first need to transform from X to Z (to the standard normal distrib...

Answered by Sarah S. Maths tutor
5756 Views

Use the product rule to differentiate y=2xsinx

The product rule states that y=uv and dy/dx=(u)dv/dx + (v)du/dx. As the equation is in this form we can let u=2x and v=sinx. Therefore du/dx=2 and dv/dx=cosx. Substituting for u and v we get dy/dx=(2x)(co...

Answered by Georgianna K. Maths tutor
13523 Views

Show that the cubic function f(x) = x^3 - 7x - 6 has a root x = -1 and hence factorise it fully.

f(-1) = (-1)^3 - (-1)*7 - 6 = -1 + 7 - 6 = 0

Hence f(x) = (x+1)(x^2 + ax - 6)

Expand this out

f(x) = x^3 + ax^2 - 6x + x^2 + ax - 6 

      = x^3 + (a+1)x^2 + (a-6)x -6

B...

Answered by James B. Maths tutor
3879 Views

What is Mathematical Induction?

Mathematical induction is a type of direct proof, where you can prove sequences or series. A good example of this is that we can prove 1 + 3 + 5 + .... + (2n-1) = n^2. There are 4 steps: 1. Prove the firs...

Answered by Ayesha H. Maths tutor
3514 Views

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