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Answers to exercises

Exercise 1

x+y

Exercise 2

xn1

Exercise 3

Both sides equal a2b+a2c+ab2+2abc+b2c+ac2+bc2.

Exercise 4

(4x21)(x3); x=±12, x=3

Exercise 5

(ab)(a+b)3

Exercise 6

13x(x+1)(x+2)(x+3)

Exercise 7

x=2

Exercise 8

(x1)2+(y3)2=11, centre (1,3), radius 11.

Exercise 9

x=2, y=4 or x=1, y=1.

Exercise 10

n=log(AP)log(1+R)