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How was the quadratic formula obtained.

We want a solution to ax^2+bx+c=0. Complete the square to get a[(x+b/2a)^2 -(b^2)/(4a^2)]+c=0. Expalding brackets and rearanging gets a(x+b/2a)^2=(b^2)/4a -c. Divide by a to get (x+b/2a)^2= b^2/4a^2 -c/a=...

Answered by Jon H. • Maths tutor

3718 Views

How many hours revision should I do between now and my exam? Can I have help coming up with a plan?

Let’s break this down. Let’s look at how much time you have before the exam and work out something manageable, because overwhelming yourself with too much revision can be counter productive.

Answered by Rose M. • English Literature tutor

4504 Views

How do you do well in an AQA GCSE English Literature exam?

First thing’s first, let’s take a look at the AQA mark scheme, because that is what your marker will be following when they get your completed paper. The first thing they talk about in their mark scheme i...

Answered by Rose M. • English Literature tutor

12061 Views

Prove that (sinx)^2 + (cosx)^2 = 1

We start with the definitions of sine and cosine, which are, respectively: sinx = opposite/hypoteneuse and cosx = adjacent/hypoteneuse. We then square the analyzed expressions to get the following:
...

Answered by Eno A. • Maths tutor

13815 Views

Outline the Knowledge Argument for the nature of the mind

The knowledge argument purports to show that the human mind is not a physical thing by showing that no amount of physical information can capture all the information there is about it. It invites us to co...

Answered by Eno A. • Philosophy tutor

2450 Views