Преобразуйте в многочлен: 1) 9x²-(y-3x)= 2) (5a+7)²-70a= 3) c(1+2c)²= 4) -6(2x-y)²= 5) (p+7)•p-(1-p)²= , буду )

9x²-(y-3x)=9x²-y+3x=3x(3x+1)-y
(5a+7)²-70a=25a²+70a+49 -70a=25a²+49
c(1+2c)²=c(1+4c+4c²)=c+4c²+4c³=c+4c²(1+c)
-6(2x-y)²= -6(4x²-2xy+y²)= -24x²+12xy-6y²
(p+7)p-(1-p)²=p²+7p-1+2p-p²=9p-1