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a) 6a - 2b +2b + (-4a) + 2ab -3b
= 6a - 4a - 2b + 2b - 3b + 2ab
= 2a - 3b + 2ab
b) 2x^2 - 5xy + 2y^2 + (-x^2) + 7xy -3y^2
= 2x^2 - x^2 - 5xy + 7xy + 2y^2 - 3y^2
= x^2 + 2xy - y^2
no 2) hasil pengurangan dari : 5a^2 - b - 2b^2 dan 9a^2 + 5ab + 2b^2
a) 5a^2 -b -2b^2 - (9a^2 + 5ab + 2b^2)
= 5a^2 - b - 2b^2 - 9a^2 - 5ab - 2b^2
= 5a^2 - 9a^2 - b - 5ab - 2b^2 - 2b^2
= -4a^2 - b - 5ab - 4b^2
b) -4p^3 + 8p^2 + p dan 5p^3 + p^2 + 5p
= -4p^3 + 8p^2 + p - (5p^3 + p^2 + 5p)
= -4p^3 + 8p^2 + p - 5p^3 - p^2 - 5p
= -9p^3 + 7p^2 - 4p
no 3)
a) 5(x+y) -2(x-y)
= 5x + 5y - 2x + 2y
= 3x + 7y
b) -5ab x (-a^2b) x (-2ab^2)
= -10a^4b^4
c) 6x : 3x = 2
d) 4p x (-2pq^2) x (-3qr) x (-5pr)
= -120p^3q^3r^2
e) (3x)^2 x (2x)^3
= (9x^2) x (8x^3)
= 72x^5
no 4)
a) (x+5)^2 = (x+5)(x+5)
= x^2 + 10x + 25
b) (x-3)^2 = (x-3)(x-3)
= x^2 - 6x + 9
c) (3a^2)^3 = 27a^6
d) (6+p)^2 = (6+p)(6+p)
= 36 + 12p + p^2
no 5)
a) 4x^2/8x^2 = 1/2
b) 2x^2y / 4y^2 = x^2/2y
c) (2x^2yz + 8xy^2z) / 2xy
= 2x^2yz/2xy + 8xy^2z/2xy
= xz + 4yz