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How do I add two fractions? (plus example)

Adding (and subtracting) fractions is more difficult than multiplying them because we need to make sure that the denominators (bottom numbers) are equal in both fractions. To do this, we may need to change t...
JB
Answered by Jenny B. • Maths tutor
5532 Views

How do I expand (x+a)(x+b)? (plus example)

The key to understanding expanding brackets is to understand that we need to multipy EVERYTHING in the first bracket by EVERYTHING in the second bracket. We can think of the calculation (x+a)(x+b) as x(x+b) ...
JB
Answered by Jenny B. • Maths tutor
16941 Views

How to add fractions

A: Firstly to add fractions the denominators have to be the same. For example, 3/7 + 2/3 firstly you need to work out the lcm of 7 and 3, in this case it is 21. So each fraction needs to be put into the form...
JL
Answered by Jennifer L. • Maths tutor
5882 Views

What is the cosine rule and when can it be used?

The cosine rule is used to find the length of a side or size of an angle. Take a look at the triangle below: For this triangle we have sides a, b and c and angles A,B and C. For this triangle the cosine rule...
KL
Answered by Kulvinder L. • Maths tutor
7923 Views

How do I solve a simultaneous equation?

You will be presented with two equations, both with two unknown values. For example: 8x-2y=19 and 3x=5+y To begin, we are going to move both unknown terms in the second equation to the same side: 3x-y=5 Then...
PC
Answered by Paul C. • Maths tutor
6209 Views