Factor Quadratic

Question

y^2+18xy+81x^2

 

and 

x^2+2x+21

Answer 1

y²+18xy+81x²  is a square; it is the square of a binomial

9*9=81 and 9+9=18, so try it from here

 

x²+2x+21

you have to use the quadratic formula for this trinomial

(-b+√(b²-4ac))/2a where a=1, b=2 and c=21

give it a try