Jawabanmu

2014-08-22T12:23:20+07:00
A. (10x-3)(5-3x)
= 50x-30 x^{2} +9x-15
= -30 x^{2} + 59x -15

b.{(10x-3)+(5-3x)} (2x+1)
= {7x+2} (2x+1)
= 14 x^{2} +7x+4x+2
=14 x^{2} +11x +2

c. (10x-3)+{(5-3x)(2x+1)}
=(10x-3)+{10x+5-6 x^{2} -3x}
=10x-3-6 x^{2} +7x+5
-6 x^{2} +17x+2