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Factorize x^2 + 4x -5 and hence find the roots of the quadratic equation y = x^2 + 4x - 5.

First, identify the integer factors of the constant. In this case -5, has factors -1,5 and 1,-5. Now check to see if the sum of either pair is equal to the value of the coefficient of x. In this case, the va...
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Answered by Alexander W. • Maths tutor
8417 Views

How does the blood move through the heart?

The heart is a pump, which moves blood around your body. It has 4 areas filled with blood, called chambers and a right and left side. There are two atria and two ventricles, one of each on each side. The blo...
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Answered by Grace M. • Biology tutor
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What is a reflex and what do you mean by a reflex arc? (both "reflex" and "reflex arc" are on the CCEArevised GCSE Biology specification)

1. A reflex is an automatic response to a stimulus . For example: If I touch a hot plate, my hand will automatically pull away from the heat. Another example is the pupillary light reflex. If you turn on a l...
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Answered by Michael M. • Biology tutor
4818 Views

Why are there no progressive tenses in German?

The sentences “I eat” and “I am eating” are the same in German: “Ich esse.” For speakers of the English language, this may be confusing. In fact, if someone says “Ich esse Fisch,” do they mean “I eat fish” o...
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Answered by Csongor M. • German tutor
2548 Views

What is the difference between 'ser' and 'estar'?

Both 'ser' and 'estar' translate as 'to be' in English, so it's a little confusing to know which one to use. The most basic rule is that 'ser' is used for permanent states such as a characteristic or someone...
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Answered by Laura O. • Spanish tutor
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