a)b²-16=(b-4)(b+4)
b)49a²b^4-121c^4=(7ab²-11c²)(7ab²+11c²)
c)a²+8a+16=(a+4)²=(a+4)(a+4)
d) (x + 3)² -(x – 3)²=[(x+3)-(x-3)][(x+3)+(x-3)]=
=6*2x=12x
a)b²-16=(b-4)(b+4)
b)49a²b^4-121c^4=(7ab²-11c²)(7ab²+11c²)
c)a²+8a+16=(a+4)²=(a+4)(a+4)
d) (x + 3)² -(x – 3)²=[(x+3)-(x-3)][(x+3)+(x-3)]=
=6*2x=12x