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Factorise x^2 - 8x - 20

x^2 - 8x - 20 (x - 10)(x+2) (Explanation and helping understanding) Remember the last 2 numbers must multiply to equal the last number in the question and add together to equal the middle number. See that th...
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Answered by Christian S. • Maths tutor
4998 Views

Expand 5(2x-6)

To begin answering this question create a small grid put 5 on the left hand side and put 2x and -6 seperately at the top of the grid then you can multiply 5 by 2x to gain 10x and multiply 5 by -6 to gain -30...
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Answered by Zaarah Y. • Maths tutor
8870 Views

How do you differentiate 5x

y=5x The change in Y over the change in X gives the differential of 5x As the power of 'x' is 1, this is brought down and multiplied by 5 and the power of x is 1-1 = 0. Therefore, the power of x is 0, which ...
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Answered by Malik M. • Maths tutor
30302 Views

Differentiate x^x

x x =e x*ln(x) So d/dx (x x ) = d/dx (e x*ln(x) ) By chain rule, we get d/dx (xln(x)) e x ln(x) Then by product rule we get [ln(x)+1] e x ln(x)
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Answered by Matthew S. • Maths tutor
4644 Views

Claire drove from Manchester to London, it took her 4 hours at an average speed of 85 km/h. Matt drove from Manchester to London, it took him 5 hours. Assuming he took the same route as Claire and took no breaks, work out his average speed in km/h.

Distance = 4 x 85 = 340km Average speed = 340 / 5 = 68 km/h
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Answered by Farhat H. • Maths tutor
3716 Views