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2. Ada 3 variabel, yaitu x³, xy, y²
3. Ada 4 suku, yaitu 3x², -y², xy, -5
Nomor 4
10b - 3a² - (5a² - 6b)
= 10b - 3a² - 5a² + 6b
= -8a² + 16
Nomor 5
2(3a + 7b - 4) + 2(4a - 5b + 2)
= 6a + 14b - 8 + 8a - 10b + 4
= 14a + 4b - 4
Nomor 6
(a + 7) (a + 5)
= a² + 7a + 5a + 35
= a² + 12a + 35
Nomor 7
x² + 3x - 18
= (x + 6) (x - 3)
Nomor 8
9m² - 25
= (3m - 5) (3m + 5)