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Calculate the gradient of the function y=x^2+6x when y=-9

-9=x^2+6x 0=x^2+6x+9 0=(x+3)(x+3) when y=-9 x=3 dy/dx=2x+6 dy/dx=2(3)+6=12
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Answered by Hassan M. • Maths tutor
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What are the characteristics of a person suffering from Learned Helplessness?

Not attempting tasks perceived as more difficult Low self-esteem Believe that their participation in the task will have little/no effect (so what's the point?)
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Explain how vaccinations can help to prevent infection

Antibodies are rapidly produced by white blood cells in response to the vaccination, and these antibodies kill the pathogens. Memory cells are produced in order to combat further infection more rapidly via r...
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Answered by Anna H. • Biology tutor
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What is terminal velocity and what causes it?

Initially, when you drop an object the only force acting on it is gravity. This accelerates the object towards the ground. As the objects speed increases so does the force of air resitance acting on the obje...
SM
Answered by Sam M. • Physics tutor
10106 Views

How do I make sure my essays are always structured well?

There are three ingredients you need when writing and structuring any English lit essay: Introduction PEE Conclusion In every essay you need an introduction to your essay, usually about the theme or characte...
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Answered by Tamsin H. • English tutor
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