What values are needed to make each expression a perfect square trinomial?

x2 + 2x +
x2 – 20x +
x2 + 5x +

Need showing work for this problem 56.25 ×25.80

How can you use synthetic substitution to tell whether a given binomial is a factor of a polynomial?

Without any equipment, you can see stars that are 2{,}800{,}0002,800,0002, comma, 800, comma, 000 light-years away. by looking through a small telescope, you can see stars that are 3{,}112{,}000{,}0003,112,000,0003, comma, 112, comma, 000, comma, 000 light-years away. approximately how many times as far can you see using a small telescope as without any equipment?