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Look at the two fractions to see what multiplier has been used. In this case, the denominators are both known: 8 and 24.
8 has been multiplied by 3 to get a new denominator of 24.
This means...
A sequence means a pattern, so the first thing to do is find the pattern. First try seeing what the difference between the numbers is. 15-7=8, 8-7=1, 1-7=6, so the pattern must be to subtract 7 each time....
x + xy + y + yx + x
= 2x + y + 2xy
4 - 2x + x2 + 2x + 4
= x2 + 8
10x - 2y
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