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First of all we want to expand the brackets out. We do this by mulitplying 4 by each number in the bracket. This then gives us 14-x = 4+4x. We then want to get all the x's on one side and the numbers on t...

To expand brackets you should multiply each term with every other term. Here it would be: 3a²-3a+4a-4 Collecting the a terms, this simplifies to: 3a²+a-4.

BODMAS is an acronym that tells you what order to do things in a maths equation. It stands for brackets, order (e.g. 2²), division/multiplication and addition/subtraction. 

3/12, 2/8. To identify fractions which are equivalent to one another, you need to identify the common multiple of both the denominator and numerator and then simplify. When a fraction is equivalent to one...

first equation: 6a + b = 16     second equation: 5a - 2b = 19    from 2 times first equation + second equation 17a = 51 meaning a = 3

.... from the first equation 6(3) + b = 16 therefore b = - 2