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a) 5x
b) 24a^2bc^2 : 8abc = 3ac
c) (3x-4)^2 = (3x)^2 + 2(3x)(-4) + (-4)^2
= 9x^2 - 24x + 16
d) 4(x+2y) -5(x-4y) = 4x + 8y - 5x + 20y
= -x + 28y
no 2)
a) 5a/6 + 7b/3 = 5a/6 + 14b/6 = (5a+14b) / 6
b) 5ab/bc x 7ab/5a = 35a^2b^2 / 5abc = 7ab/c
c) (8xy^2 : 4x^2y) . (3x^2y^2) = (2y/x )(3x^2y^2) = 6xy^3
no 3)
a)
7x^2 + 5xy - 10y^2
4x^2 - 2xy + 9y^2
--------------------------- -
3x^2 + 7xy - 19y^2
b)
-3x^2 -6x - 10
6x^2 -9x + 15
------------------- -
-9x^2 + 3x - 25
c)
5(p^2 + 2pq) = 5p^2 + 10pq
2(2p^2 + pq) = 4p^2 + 4pq
---------------------------------------- -
p^2 + 6pq
no 4)
x = 2 , y = -3 , z = 4
a) 4x + 3y + 2z = 4(2) + 3(-3) + 2(4)
= 8 - 9 + 8
= 7
b) 2x - 5y + 3z = 2(2) - 5(-3) + 3(4)
= 4 + 15 + 12
= 31
c) x^2 - 2y^2 - 6z^2 = (2)^2 - 2(-3)^2 - 6(4)^2
= 4 - 18 - 96
= - 110
5)
p = (5x-2)
l = (x+3)
a) k = 2(5x-2 + x+3)
= 2(6x + 1)
= 12x + 2
b) jika x = 2
maka p = 5(2) - 2 = 8
l = 2+3 = 5
luas = 8 x 5 = 40 cm^2