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How do I solve the quadratic equation x^2+4x+3=0

When solving a quadratic equation like this it is useful to write it in the form (x+a)(x+b)=0, as this is simply saying 'two numbers multiplied together equal zero'. A general rule in maths is that whenever ...
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Answered by Edward R. • Maths tutor
7122 Views

Why did the Nazis appeal to the German voters?

After the First World War and the Wall Street crash, Germany's economy was at an all time low point. The recession had increased the number of the unemployed significantly and morale was low. The Nazi party ...
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Answered by Emily S. • History tutor
14658 Views

Explain how a vaccination prevents infection.

A vaccine causes white blood cells to produce anitbodies. Antibodies are proteins which kill pathogens, such as viruses and bacteria. If the body is reinfected by the same pathogen as the vaccine then the wh...
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Answered by Tomas C. • Biology tutor
5965 Views

For a cuboid, the longest side is two units more than the shortest side, and the middle length side is one unit longer than the shortest side. The total surface area of the cuboid is 52 units². (a) Construct an equation to calculate the surface area.

First label all the sides with letters:longest side = amiddle length side = bshortest side = cNow convert the question into equation form: "the longest side is two units more than the shortest side&quot...
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Answered by Eden H. • Maths tutor
9700 Views

Dipen and Nisha are planning a wedding reception. Nisha says, “I want to invite 70 guests.” Dipen says, “If we invite one-fifth fewer guests, we will save more than £500” Is Dipen correct?

Prices are: £40 per guest. Total cost reduced by 5% with over 60 guests. First, we work out the cost of Nisha's suggestion. £40 x 70 guests = 2800 To find 5% of this, we can divide by 10 to get 10% (280), an...
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Answered by Lily M. • Maths tutor
7891 Views