A. What must be added to the following expressions to make a perfect square trinomial?

1. x²+4x+____
2. x²-10x+____
3. x²-16x+____
4. x²+14x+____
5. 4x²-____ +16

B.Express the perfect square trinomial in column A as a square of binomial

1.( )²
2.( )²
3.( )²
4.( )²
5.( )²​