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how do you do binomial expansion when the power is a negative

There is a simple equation, similar to the normal binomial expansion, thats easy to remember once youve used it a few times.

(1+x)ⁿ=1+nx+{[n(n-1)]/2!}x²+{[n(n-1)(n-2)]/3!}x

Answered by Sarah M. • Maths tutor

10234 Views

When to use the subjunctive (congiuntivo)

The subjunctive can be quite tricky for English speakers as it is rarely used in the English language. There are several cases in which one should use the subjunctive when speaking Italian:

Answered by Paola T. • Italian tutor

2199 Views

How do you form the perfect tense in French?

In French we need two verb parts to form the perfect tense: the auxiliary (avoir or être) and the past participle of the verb you want to use. Let’s start simple with avoir and être. This pa...

Answered by Megan H. • French tutor

3697 Views

What is the cognitive approach to explaining depression?

Cognitive approaches look at the meditional processes that govern behaviour. One cognitive explanation of depression was proposed by Aaron Beck. This is the 'negative traid', which invovles having negativ...

Answered by Sophie P. • Psychology tutor

3971 Views

How should I answer a question that asks me to analyse a source?

Primary source analysis requires you to use examples of how people in the past wrote about or depicted different phenomena. FIrst, it is important to link the particular source to a wider historical perio...

Answered by Marcell S. • History tutor

2728 Views