Jawabanmu

2014-08-21T13:33:07+07:00
3. a) (7a + 13b) - (3a + 4b) = 4a + 9b
    b) (4 x^{2} +2x) - (5 x^{2} -3x) = - x^{2} +5x

4. a) 15 + 3(x-2) = 15 + 3x - 6 = 9 + 3x = 3 (x+3)
    b) 5x - 10y - 6x + 3y = -x -7y
kenapa soalnya sulit
banyak2 latihan aja. ^^
iyha ... thankzz yah ;)
2014-08-21T18:04:52+07:00
3)a. 3a+4b dari 7a+13b
= (7a+13b)-(3a+4b)
= (7a+13b)+(-3a-4b)
= 7a-3a+13b-4b
= 4a + 9b
b. 5x²-3x dari 4x²+2x
= (4x²+2x)-(5x²-3x)
= (4x²+2x)+(-5x²+3x)
= 4x²-5x²+2x+3x
= x²+5x
4)a. 15+3(x-2)
= 15+3x-6
= 15-6+3x
= 11+3x
b. 5(x-2y)-3(2x-y)
= 5x-10y-6x+3y
= 5x-6x-10y+3y
= x-7y
maap kalau salah :)