\(1,\\ a,=\left(a+1\right)\left(3a+1\right)\\ b,=2\left(2-b\right)\\ c,=3a\left(3a+4\right)\\ d,=\left(x-2\right)\left(x^2-1\right)=\left(x-2\right)\left(x+1\right)\left(x-1\right)\\ 2,\\ a,=\left(1-a\right)^2\\ b,=\left(a+3\right)^2\\ c,=\left(y-3\right)^3\\ d,=\left(2-x\right)\left(4+2x+x^2\right)\\ e,=\left(10-x\right)\left(10+x\right)\)


