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How do I find the root of a quadratic equation?

Usually the easiest way to find the root of a quadratic is to factorise it so you have something a form similar to - (x+2)(x-1)=0. From here you need to find a value for x that makes each bracket equal to ze...
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Answered by Nicky F. • Maths tutor
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When should I use the preterite and the imperfect form of the past tense?

In general the preterite is used when something has been completed. If an action has a definite start and end then you should be using the preterite, this can be both if it is something that happened once or...
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Answered by Nicky F. • Spanish tutor
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What is Natural Selection?

Natural Selection is the accepted theory of evolution first postulated by Charles Darwin and can be thought of as 'survival of the fittest'. It is the process by which a species gradually evolves through tim...
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Answered by Ellie W. • Biology tutor
6275 Views

How is the perfect tense formed?

The perfect tense is formed from : The auxiliary verb haber + the past participle of the verb , either ending in -ADO(-ar verbs) or -IDO(-er and -ir verbs) He hablado, He comido, He vivido. Example : COMER H...
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Answered by Rachelle O. • Spanish tutor
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What is the name of the first stage of respiration?

Glycolysis. This is an anaeorbic process whereby glucose is converted to pyruvate via triose phosphate. This process gives out a total of 4 ATP molecules but requires 2 ATP molecules to convert glucose to tr...
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Answered by Adam S. • Biology tutor
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