ANSWERS 14. Complex numbers
1. 5 + 7i ; 5 + 3i ; –1 + 0i 2. 1 + 3i ; 1 – 7i ; –2 + 2i 3. 9 + 6i ; –6 + 9i ; 3 + 15i ; 7 – 22i ; 22 – 6i
4. 1 + 2i; 2 – i ; 5.
1 + 6
1 6 i
3 2 +
6. 2 + 3i use bb
–– a 2a
±
7. 8. (a) 6 + 2i
518 2,, , , ,
++ + 1
2 34
22 17
36 13
ii 13i;;– 6
2 2 4ac
29 10 36 72 29
, 4
3. 22, 11, 14, 1, 36, 6, 16, 13, 28, 1, 42 4. No 5. No 6.
(i) x2 (ii) x2 (iii) x2 (iv) x2 (v) 2x2 (vi) 6x2 (vii) 10x2 (viii) x2
+ 3x + 2 + 6x + 5 + x –20 – 7x + 12 –5x – 3
+ 17x + 12 + 19x – 2
– 2x
7. (a) (x + 3)(x + 2) (b) (3x – 1)(x + 4) (c) (x – 13)(x + 4) (d) (2x + 1)(x – 3) 7, 16
8.
9. 0·47, –2·14 10. 9
15. Calculus 1. 30t 2
4.
6m 10
; 20t ; 10; 0; 8t + 3; –6t –3
2. v + 400t + 50 a = 400m/s2
–26m/s 100
5. (a) 77m, 50m/s (b) 2m, 17m/s (c) 1m, m/s
1 3
3
(d) 1m, m/s (e)
5 16 –,
1 3
10 9
m/s (f) 38m, 143m/s
–12t –4
1. Nl, Nl, Nl, 0 2.
17. Infinity and Paradoxes 0, ∞
4. 0m 5. (a) a member of itself because the set itself is a large set
(b) not a member of itself because the set itself is not a small set
(c) a paradox
16. Interesting Numbers
1. The sum of the divisors of the numbers 1 to 10 are 1, 1, 1, 3, 1, 6, 1, 7, 4, 8. There are no friendly pairs.
2. Remember you do not include the number itself 1 + 2 + 4 + 5 + 8 + 10 + 20 + 25 + 40 + 50 + 100 = 265
165
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