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How to determine the number of unique real roots of a quadratic equation.

Take any quadratic equation, eg/ 3x 2 +4x-2=5 , and rearrange to equal 0 , ie/ 3x 2 +4x-7=0 (if you have an expression, ie/ there is no equals sign, then simply equate the expression to 0 ). Now, we use the ...
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Answered by Yaniv P. • Maths tutor
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Describe how blood vessels are able to assist in the control of body temperature.

If body temperature is too high: Capillaries dilate, increasing the blood supply to the skin and allowing heat to be lost from the body by radiation. If body temperature is too low: Capillaries constrict, re...
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Answered by Merrin W. • Biology tutor
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What is Pythagoras's theorem?

For any right-angled triangle, the square of the hypotenuse (the side opposite the right angle) is the sum of the square of the remaining two sides.
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Answered by Bhavika M. • Maths tutor
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So, what actually is a mole?

A mole is simply a unit of measurement of any substance that contains as many atoms as there are in 12 grams of Carbon-12. Why Carbon-12? Carbon-12 is the standard by which we compare the mass of any other m...
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Answered by Patrick Q. • Chemistry tutor
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I'm doing GCSEs, isn't it too early to be thinking about applying for medicine?

Simply, no. Whilst it is imperative to keep an open mind when it comes to what degree you wish to study in university medicine often differs from other subjects. Although many subjects are very difficult to ...
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