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The quadratic equation 2x^2+8x+1=0 has roots a and b. Write down the value of a+b and ab and a^2+b^2.

Since the quadratic has roots a and b, this means it can be fatored as 2(x-a)(x-b)=0. Expanding this out we get 2x^2-2(a+b)x+2ab=0 and matching the coefficients for the terms x^1 and x^0 we get a+b=-4 and ab...
JT
Answered by Joshua T. • Maths tutor
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What is diffusion and how is it different from osmosis?

Diffusion can otherwise be known as the technical term for the movement of particles. It is the process where the particles in question moves from an area where it is high in concentration to an area where i...
AK
Answered by Alvina K. • Biology tutor
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How does the structure of a nucleotide contribute to the structure of DNA, and its function as a carrier of genetic information?

There are four DNA nucleotides: Adenine, Cytosine, Thymine and Guanine. They are each made up of a nitrogenous base, deoxyribose sugar, and a phosphate group, and the four nucleotides differ in the structure...
MA
Answered by Matthew A. • Biology tutor
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Explain why an increase in labour productivity is likely to reduce the deficit on the current account of the balance of payments.

A current account deficit arises when import expenditure exceeds export revenue. An increase in labour productivity implies that there is an increase in efficiency in production and also a rise in output for...
TE
Answered by Tom E. • Economics tutor
16898 Views

What is the difference between "explaining" and "analysing"?

An exam answer that "explains" a passage or poem will be a less thoughtful response; if you're explaining a text, you're giving an overview of what happens ("In Of Mice and Men , Lennie and Ge...
LC
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