Jawabanmu

2014-09-13T18:37:34+07:00
A. 20 y -100
B. 5x pangkat 2 + 24x -5
C. -4x pangkat 2 + 28x - 49
 
2014-09-13T19:08:07+07:00
A. {10.2y}+{10.(-10)} = 20y-100
b. {x.5x}+{x.(-1)}+{5.5x}+{5(-1)}
    = 5 x^{2} + (-1x) + 25x + (-5)
    = 5 x^{2} + 24x -5
c. {7.2x}+{7.(-7)}+{-2x.2x}+{-2x.(-7)}
    = 14x + (-14) +( -4 x^{2} ) + 14x
    = 28x - 14 - 4 x^{2}