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What's the quadratic formula used for?

Firstly, it's important to understand what the formula is. It is essentially a re-arrangement of a quadratic equation, however the formula can be learnt so that it can be applied quickly within an exam conte...
JH
Answered by James H. • Maths tutor
4198 Views

factorise x^2 - x - 6

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KC
Answered by Kushal C. • Maths tutor
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The length of a plank of wood is 80cm to the nearest 1cm. What is the largest and smallest possible value for the actual length of the plank?

Bounds can be used when a value has been approximated. e.g. The length of a plank of wood is 80cm to the nearest 1cmThe lower bound is the smallest value that would round up to the estimated value. In this e...
LT
Answered by Lydia T. • Maths tutor
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f(x)=2x^2 -8 What is the value of x if f(x)=0, x>0

This would be a typical B grade GCSE question. Firstly, let's set f(x) to 0 , where now we have 0=2x 2 -8 . We now need to rearrange to find x. First, move the -8 to the other side of the "=" sign,...
TD
Answered by Tutor122314 D. • Maths tutor
5846 Views

Factorise 12x^2 +17x +6

If you imaging the equation as ax^2 +bx +cYou multiply the numbers of a and c together. This number then becomes the product of two numbers that either add or subtract to make the number for b.So 12 x 6 is 7...
AB
Answered by Amy B. • Maths tutor
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