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S2 Maths Revision (Chapter 1-3)

S2 Maths Revision (Chapter 1-3) - Revision...

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Revision Exercise(Chapters 1 to 3) Chapter One Approximation and Errors 1. There are three kinds of tickets available for the concert of the superstar Wong Fun. Price Quantity $400 362 $200 851 $75 2 753 (a) By rounding off the quantity of each kind of ticket correct to 2 significant figures, estimate the total amount received after selling all the tickets. 2. The table below shows the results of the 5 major subjects of Elisa in her Form Five Graduation Examination. Subject English Chinese Mathematics History Geography Marks 77 84 79 85 82 Since these marks are all around 80, Elisa estimated the total marks for the 5 subjects to be 400. Find the percentage error of Elisa’s estimate. ( Give the answer correct to 2 significant figures .) (16 marks) Chapter Two Identities 1. Show that ( x + 1)( x + 4) = ( x + 2)( x + 3) - 2 is an identity. (8 marks) 2. Show that ( x - 1)( x + 3) = ( x - 2)( x + 2) is not an identity. (8 marks) 3. If A ( x + 2) - 4 3( x + 1) - B , find the values of the constants A and B .
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