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Expand and simplify x(2x+1)(x-3)

First multiply the brackets to get: (2x 2 - 6x + x - 3), Simplify to get: (2x 2 - 5x - 3), This is then all multiplied by x to get: 2x 3 - 5x 2 - 3x.
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Answered by George G. • Maths tutor
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Explain the photo-electric effect and describe how the intensity of light effects rate of electron emission.

The photo-electric effect is the way in which electrons are released from the surface of a metal when there is an incident light ray. The particle model of light, as part of wave-particle duality, suggests t...
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Answered by Ira W. • Physics tutor
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Do I need work experience to apply to medical school?

Whilst for some medical schools work experience is not mandatory, for the majority, it is highly recommended. Gaining work experience in a healthcare profession is not only valuable in ensuring that medical ...
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How would you structure an answer to this question - 'Compare how the authors of two texts you have studied present aspects of desire. You must write about AT LEAST TWO poems in your answer AS WELL AS a prose text you have studied. [25 marks]'

Following an introduction that sets out your argument and the context that will support it, each paragraph of your essay should include a topic sentence (which outlines the argument you will make in the para...
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Answered by Hannah S. • English tutor
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what forces hold the ions together in an ionic compound?

electrostatic forces between oppositely charged ions.
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Answered by Anushka J. • Chemistry tutor
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