Jawabanmu

2014-01-10T19:06:53+07:00
Perkalian, 

1. x.3x+x.1 -1.3x-1.1 = 3x^2 + x - 3x -1 = 3x^2 -2x -1
2.  5.4+(5.8x)+(-2x.4)+(-2x.8x) = 20 + 40x-8x-16x^2 = -16x^2+32x+20
3. x(x-2) = (x.x)+(-2.x) = x^2 - 2x
4. (x-3)² = x^2 +(2.x.(-3))+(-3)^2 = x^2-6x+9
   konsep sederhana : (x-a)^n = x^n - n.a.x - a^n

sekian. CMIIW
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