meaning to multiply something into a term x. for example, this term x can be (3+a), or even (a+b+c+8). let us name that something 'y'. to expand, we put y(x), meaning y times x. another example, -g(a) = -ag, or minus (a times g). if the set x contains more than one term, multiply all the terms by y. y(a+b) = ay + by.remember, minus times minus is a plus, and minus times plus is minus.
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A chord is a straight line joining any 2 points on the circumference of a circle
i don't really know to be honest... i know that a derived property follows from a definition; (a definition is a minimum set of conditions needed to describe something)
In America it is math, in most European countries it is maths
Yes, math is called maths in Welsh.
you have to pick Maths for GCSE's but you can also pick additional maths which is just more maths than normal eg you may have 5 peroids of maths a week but with additional maths you may have 9 peroids of Maths a week