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Expand and simplify: 5(x + 3) - 3(y - 2)

To expand the brackets you need to multiply each item inside with the number on the outside. The first bracket is expanded as follows: 5 x = 5x, 5 3 = 15, therefore 5x + 15. There is a minus sign in front of...
AL
Answered by Arabella L. • Maths tutor
10927 Views

Explain the process of nuclear fusion in the Sun.

In the Sun the main fusion process is the fusion of hydrogen nuclei to form helium nuclei. Any two hydrogen nuclei repel each other as they are both positively charged, for the fusion to occur the two nuclei...
JA
Answered by Jake A. • Physics tutor
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How do I do simultaneous equations?

example: solve the simultaneous equations 3x+2y=4 and 2x+y=3 1: 3x+2y=4 2: 2x+y=3 want to either get same number of x's or same number of y's in equation 1 and equation 2 easiest way to do this is by making ...
CS
Answered by Cerys S. • Maths tutor
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Basic Conversions (Binary, Hexadecimal, etc)

1. Convert the hexidecimal number D6 to decimal Since it is base-16, we multiply the first digit (6) by 16^0 - giving us 6 We then multiple the second digit (D - which equates to 13) by 16^1 - giving us 208 ...
CJ
Answered by Calum J. • Computing tutor
3947 Views

Common mistakes made in A-Level exams

We all make silly mistakes when in comes to Maths, so here are some common mistakes to help you out. 1. Partial Fractions: Many students think x+2/(x+1)^2 becomes A/(x+1) + B/(x+1) This is however incorrect,...
CJ
Answered by Calum J. • Maths tutor
5070 Views