Please help me factor these?

Question

#1.) 4(x+1)^2 - 49 

I got (4x+4-7)(4x+4+7) but its wrong and idk why :| 

#2.) 16x^6 - 2 

For this one, I got a GCF of 2 and I'm not sure if I would keep that in front of the factors. 

#3.) 4(x + 1)^2 - y^2

 

 

Answer 1

1.

Hence the expression is factorized as [2x +9 ] [2x - 5] .

Answer 2

2.

Hence the expression is  

Answer 3

3.

The expression is  

This is in the form of  

Hence the expression is  .