Question

плиз срочно нужно даю 29 б

Answer 1

1)...=x²-6x+9-x²-9x=9-15x.
2)...=4a²+20a+25-20a-25=4a².
3)...=a²-9+a²+4a=2a²+4a-9.
4)...=16x²+40xy+25y²-16x²+40xy-25y²=80xy.
5)...=b²+14bc+49c²-49c²+14bc-b²=28bc.
6)...=(16-y²)(16+y²)=256-y⁴.
7)...=(p²-9)².
8)...=(100-c⁴)(100+c⁴)=10000-c⁸.