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How do I solve x^2+6x+8=0?

Ok, so we would call this a quadratic equation because it is written in the form of ax^2+bx+c=0 (in our case, a=1, b=6, c=8).Luckily, this type of quadratic equation can be factorised, so we can solve it eas...
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Answered by William S. • Maths tutor
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What is Price Elasticity of Demand?

Price Elasticity of Demand refers to an economic measure which evaluates the change in price of a good against its respective change in demand. In simple terms: If the price of a good rises by a certain amou...
KC
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Describe two different test tube reactions to identify the following organic compounds: propanal and benzoic acid.

There are several different answers one could make and an exam question would just require one for each. 1) Propanal - from the ending "al" this is an aldehyde. - Add Tollens' reagent. Positive res...
DD
Answered by Daniel D. • Chemistry tutor
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Solve the simultaneous equations y = 2x-3 and x^2 +y^2 = 2

Let the first equation be equation 1 and the second equation be equation 2. Firstly, you must substitute equation 1 into equation 2. This is because there are currently two unknown values in each equation (x...
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Answered by Daniel D. • Maths tutor
30872 Views

How does blood return from the feet back to the heart?

First, some general advice: It is not uncommon for medical interviews, particularly at Oxbridge, to test the interviewee's ability to think laterally, creatively or "outside of the box." When prese...
AV
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