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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
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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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How can do you factorize the equation x^2+6x+8

Here, we see that the term in x in the equation is 6, so we start by looking for a perfect square where the second term would be 6 : we get 6/2 = 3 so we try (x+3) 2. However, (x+3) 2 = x 2+ 6x + 9. We thus ...
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Answered by Marine S. • Maths 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
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Briefly describe how the autonomic nervous system returns internal body temperature to normal following a rise in body temperature

Body temperature in mammals is controlled and maintained by a small part of the brain called the hypothalamus. Information about the temperature both inside and outside of the body is detected by thermoregul...
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Answered by Chantal R. • Biology tutor
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