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b) (y+5)(y+z)
2. a) 102 x 98 = 102 (100-2) = 10200 - 204 = 9996
b) 103 x 97 = 103 (100-3) = 10300 - 309 = 9991
c) 205 kuadrat = (200+5) (200+5) = 40 000 + 2000 + 25 = 42025
d) 398 kuadrat = (400-2) (400-2) = 16 000 - 1600 + 4 = 158 404
kayake itu,
-2x(3 +40y)
1b. y² +7y +10
y² +5y +2y +10
(y² +5y) +(2y +10)
y(y +5) +2(y +5)
(y +2) (y +5)
2a. 102 x 98
(100 +2) (100 -2)
100² -2²
10000 -4
9996
2b. 103 x 97
(100 +3) (100 -3)
100² -3²
10000 -9
9991
2c. 205²
(200 +5)²
200² +2.200.5 +5²
40000 +2000 +25
42025
2d. 398²
(400 -2)²
400² -2.400.2 +2²
160000 -1600 +4
158400 +4
158404