Algebraic expresssion.pptx

# Algebraic expresssion.pptx - Algebra Algebraic expressions...

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Algebra Algebraic expressions

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Maths Market Pricelist Apples \$1 Bananas \$2 Mangoes \$3 Tomatoes 50c Carrots 20c Potatoes 10c How much is an apple and a banana? How much is an apple and a mango? How much are 3 tomatoes?
Mathematicians are lazy! Why write whole words when just one letter will do? For example: a + b a + m

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But what if we don’t have a pricelist? Let’s think about buying 3 tomatoes We could write the price of 3 tomatoes as t + t + t Here a letter is used to represent the price of a tomato In algebra we write the sum t + t + t as 3 t 3 lots of t or 3 times t Notice that the expression is 3 t The multiplication sign has been omitted We write 3 t (3 tomatoes) not t3 (tomatoes 3)
Variables and constants In the expression is 3 t t is a variable A value that can change 3 is a constant Because the number of tomatoes being bought is 3

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