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Factorise 12x^2 - 20x + 3

We know our answer is going to look like this: (ax + b)(cx + d). First we can split our original equation in order to make it easy to simplify. As we know that 12 multiplied by 3 is equal to 36 we can split ...
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Answered by Emma G. • Maths tutor
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The straight line with equation y=3x-7 does not cross or touch the curve with equation y=2px^2-6px+4p, where p is a constant.(a) Show that 4p^2-20p+9<0 (b) Hence find the set of possible values for p.

(a) If we consider the intersection of these two lines then, 3x-7=2px^2-6px+4p.This can be rearranged into the form ax^2+bx+c=0 such that, 2px^2+(-6p-3)x+4p+7, where a=2p, b=-6p-3 and c=4p+7.However, since t...
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Answered by Will G. • Maths tutor
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How do you differentiate using the chain rule?

The chain rule is used where the equation you are looking to differentiate is a function that is itself raised to a power. For example, we might have y = (x 2 -2) 3 and want to differentiate with respect to ...
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Answered by Oliver B. • Maths tutor
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Derive the following: f(x)=(96/x^2)+kx

f'(x)=(-192/x^3)+k
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Answered by Adrien D. • Maths tutor
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A family go into a shop, they buy three sandwiches and two packets of crisps. It costs them £9. Another family buy five sandwiches and six packets of crisps. It costs them £19. How much does two sandwiches and five packets of crisps cost?

We will call sandwiches S and packets of crisps C. These are the 'unknowns'. From the information we can write down two equations. Equation 1: 3S + 2C = 9 and Equation 2: 5S + 6C = 19. We need two equations ...
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Answered by Nicholas W. • Maths tutor
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