Answers to exercises
Exercise 1
x+y
Exercise 2
xn−1
Exercise 3
Both sides equal a2b+a2c+ab2+2abc+b2c+ac2+bc2.
Exercise 4
(4x2−1)(x−3); x=±12, x=3
Exercise 5
(a−b)(a+b)3
Exercise 6
−13x(x+1)(x+2)(x+3)
Exercise 7
x=2
Exercise 8
(x−1)2+(y−3)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)