p.18 4. (a) 22-x, x+13, 15-x, respectively
p.26 4. (-6/5, 7/15)
p.26 7. (3/2, -7/10)
p.26 8. 6 and -2 ( (6, -2), (-2,6) are redundant.)
p.26 9. (1, -1) is redundant.
p.43 7. 1/8 into 8
p.43 x=0 as well. (x could be 0 before we take a log.)
p.58 2. ''k>10 or k=10'' or "kp.58 4.(b) c=15/4
p.58 8. reverse inequality signs to different directions.
p.76 Switch -d into d in the inverse matrix.
p.78 3. 7
p.86 2. (b) 3:4
p.92 3. (b) b=-7/2
p.102 3. (b) sqrt(x+3/2)+2
p.102 5. (b) y=ln(4x-1)
p.130 (a) -sqrt{5}/2 (b) sqrt{5}
p.132 27. eliminate the last approximate.
p.143 3. 16P8
p.154 9. add "y=11x-25"
p.161 1. 196/9
p.168 4. x=3/2, y=4
p.178 6. add "+C".
Book
The Essential Guide to IGCSE: Additional Math: 2017-2019
by Harim Yoo
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p.18 4. (a) 22-x, x+13, 15-x, respectively
p.26 4. (-6/5, 7/15)
p.26 7. (3/2, -7/10)
p.26 8. 6 and -2 ( (6, -2), (-2,6) are redundant.)
p.26 9. (1, -1) is redundant.
p.43 7. 1/8 into 8
p.43 x=0 as well. (x could be 0 before we take a log.)
p.58 2. ''k>10 or k=10'' or "kp.58 4.(b) c=15/4
p.58 8. reverse inequality signs to different directions.
p.76 Switch -d into d in the inverse matrix.
p.78 3. 7
p.86 2. (b) 3:4
p.92 3. (b) b=-7/2
p.102 3. (b) sqrt(x+3/2)+2
p.102 5. (b) y=ln(4x-1)
p.130 (a) -sqrt{5}/2 (b) sqrt{5}
p.132 27. eliminate the last approximate.
p.143 3. 16P8
p.154 9. add "y=11x-25"
p.161 1. 196/9
p.168 4. x=3/2, y=4
p.178 6. add "+C".
Paperback
$13.95