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D1. Elementary algebra
Expand (cx-a)(dx+b)

Vocabulary Algebraic expressions like (3x-1) or (2x+2) are called linear. Any expression that can be written in the form ax+b, where a and b are numbers, is called a linear expression. Linear expressions can be multiplied together. This is often refered to as multiplying out brackets (or expanding brackets), for example, (3x - 1)(2x + 2)=6x2 + 4x - 2 Use the display below to improve your skills in multiplying out. Try to do it all in your head, so that you can look at the question and say - after a moment or two - the answer!

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