Jawabanmu

2014-09-12T19:26:10+07:00
(7-2x)(2x-7)
= 14x - 49 -  4x^{2} + 14x
= - 4x^{2} +28x - 49
1 2 1
2014-09-12T19:26:51+07:00
(7-2x) (2x-7)
=14x-49-4x²+14x
=-4x²+14x+14x-49
=-4x²+28x-49