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Maths
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How do you solve an equation like x^2+3x-4=0

There are many ways of solving this equation, which is called a second order polynomial (where the order describes the highest power of x), let's focus on the most general for now: the quadratic formula. ...

VL
Answered by Victor L. • Maths tutor
2831 Views

c is a positive integer. Prove that (6c^3+30c) / ( 3c^2 +15) is an even number.

Our starting equation (6c3+30c) / ( 3c2 +15)  can be factorised by 6c on the top row and 3 on the bottom row so you get 6c(c2+5) / 3(c2+5). Because (c2

LA
Answered by Lenya A. • Maths tutor
5552 Views

How do I multiply two brackets without missing terms when multiplying?

In order to answer these sorts of questions where you have double brackets and need to expand them it is useful to use the FOIL (First Outer Inner Last) method. By using this systematic method it ensures ...

AR
Answered by Andrew R. • Maths tutor
5995 Views

Jodie buys 12 cans of cola. There are 330 ml of cola in each can. Rob buys 4 bottles of cola. There is 1 litre of cola in each bottle. Rob buys more cola than Jodie. How much more?

Again, I would highlight the important points of the question.

  1. Jodie buys 12 cans which are 330ml in each can.

  2. Rob buys 4 bottles which are 1 litre each.

...
NS
10103 Views

Amber earns £7 for each hour she works from Monday to Friday. She earns £10 for each hour she works on Saturday. One week Amber worked for 4 hours on Saturday. That week she earned a total of £180. How many hours did Amber work that week?

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