14.a)x(x^2-2x+1)=x(x-1)^2
d)2y(x^2-6x+9)=2y(x-3)^2
b)x(9x^2+6x+1)=x(3x+1)^2
c)5(x^2+4x+4)=5(x+2)^2
e)4xy(x^2+2xy+y^2)=4xy(x+y)^2
15.c)2x(x^2-4)=2x(x-2)(x+2)
f)3x(4x^2-9y^2)=3x(2x-3y)(2x+3y)
15.a)5(x^2-1)=5(x-1)(x+1)
d)3x(x^2-1)=3x(x-1)(x+1)
b)x^2(x^2-1)=x^2(x-1)(x+1)
2xy(x^2-4y^2)=2xy(x-2y)(x+2y)
16.a)(x-2)^2-4y^2=(x-2-2y)(x-2+2y)
c)(x+1)^2-x^4=(x+1-x^2)(x+1+x^2)
e)(x+y)^2-(xy)^2=(x+y-xy)(x+y+xy)
b)(x+y)^2-1=(x+y-1)(x+y+1)
d)x^4-(y-3)^2=(x^2-y+3)(x^2+y-3)
f)(2x+3y)^2-4x^2y^2=(2x+3y-2xy)(2x+3y+2xy)
