Top answers


How do I expand a factorised equation?

Firstly put the equation into the the form (x+a)(x+b) this will make things easier later on. Therefore, an equation such as (x+1) 2 would become (x+1)(x+1) Next expand the brackets. To do this simply multipl...
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Answered by Emily G. • Maths tutor
3982 Views

How do I form an imperfect subjunctive 'if' clause

Firstly, form the imperfect subjunctive. To do this put the verb in the third person of the preterite (comer becomes comieron). Now drop the -ron leaving comie. Then add the Imperfect Subjunctive endings... ...
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Answered by Emily G. • Spanish tutor
3443 Views

How to derive the formula for a geometric series sum

Any geometric series is defined by an initial term a , and a common ratio b . This means that we start with a and multiply by b to get each next term.And so the general geometric series is written:a r^ 0 ,a ...
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Answered by Zeeshan A. • Maths tutor
8325 Views

Why do all objects fall at the same rate in a vacuum, independent of mass?

This is only the case in a vacuum because there are no air particles, so there is no air resistance; gravity is the only force acting. You can see it for yourselves with this easy experiment: Take one piece ...
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Answered by Luke T. • Physics tutor
88642 Views

What are different animal's cognitive limitations? How can we observe this in the wild?

There is obviously no black and white answer, but the study of behavioural ecology tackles this issue. Empirical studies in the animal's natural environment are more difficult but more rewarding to conduct t...
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Answered by Chris G. • Biology tutor
5410 Views