a)2(u-3)u-(u-3)(u+3) =(u-3)(2u-u-3)=(u-3)(u-3)=(u-3)²=u²-6u+9b)-b(b+5)-(b-6)(b+6)=-b²-5b-b²+36=-2b²-5b+36
а) ответ: 2u(2) - 6u -9= u(2)-6u-9б) B(2)-5B-B(2)+36=-2B(2)-5B+36
a)2(u-3)u-(u-3)(u+3) =(u-3)(2u-u-3)=(u-3)(u-3)=(u-3)²=u²-6u+9
b)-b(b+5)-(b-6)(b+6)=-b²-5b-b²+36=-2b²-5b+36
а) ответ: 2u(2) - 6u -9= u(2)-6u-9
б) B(2)-5B-B(2)+36=-2B(2)-5B+36