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Using the quadratic formula factorise 2x^2 + 7x + 11 =0

Using the substitutions a=2, b=7 and c=11 with the quadratic formula we get two values of x at 3.39 and 0.89.
EA
Answered by Emily A. • Maths tutor
6984 Views

What are partial fractions for and how do I find them?

Being able to find partial fractions is very useful for complex algebraic fractions that cannot be intergrated in their current form. Breaking it down into a sum of it's partial fractions gives two (or more)...
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Answered by Christine T. • Maths tutor
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What specialised structures do the lungs have to allow diffusion of gases?

The lungs are highly specialised. They have alveoli which are small air sacs. Alveoli give the lungs a big surface area, meaning that more oxygen can diffuse from the lungs into the blood stream, and more wa...
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Answered by Bethany H. • Biology tutor
15114 Views

What is the subjunctive and when should I use it?

The subjunctive is what we call a 'mood', which is a verb form conveying the attitude of the speaker. By now, you'll be used to employing the indicative mood, which we use to convey facts or statements the s...
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Answered by Rowan A. • French tutor
2693 Views

Psychologists carry out research into the effectiveness of SSRIS in treating depression. A possible ethical issue which may arise during the study is protection of participants from harm. How could the psychologist deal with this issue? - 4 marks

Participants must be reminded before throughout and after the study that they have the right to withdraw their data from the findings if they are showing signs of distress. (2) When pubishing socially sensit...
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