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Using the "complete the square" method, solve the following x^2 +4x - 21 =0

x 2 +4x-21= 0, This can be factorised into brackets as shown: (x+2) 2 - 4 - 21 = 0 SImplified, so all x's are on one side of the equation: (x+2) 2 = 25, Removing square root, DONT FORGET "±" : (x+2...
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Answered by Charlotte S. • Maths tutor
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Differentiate y= 8x^2 +4x +5

dy/dx= (2 * 8)x (2-1) +4 = 16x + 4
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Answered by Juevaneeta J. • Maths tutor
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How can genetically identical twins look different?

There are two key pieces of terminology that it is important to understand with this question; genotype and phenotype . All sexual organisms inherit a mix of genes from their parents. This mix - the genetic ...
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Answered by Josh H. • Biology tutor
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Is normal expiration, at rest, a passive or active process in a healthy individual? And why?

Expiration is a passive process. It happens due to relaxation, not contraction, of the muscles of the chest. As well as the elastic recoil of the lungs. Both of these processes do not require energy and henc...
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Answered by Samuel J. • Biology tutor
11053 Views

Discuss the use of allusion in James Joyce's A Portrait of the Artist as a Young Man

Students are often confronted with the choice between a thematic based and a formal based question in examinations. In my experience of tutoring, students often prefer to tackle the thematic question, believ...
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