i need the answer

Question

y=x² +9x+20

Answer 1

Y = X^2 + 9X + 20

 

  Choose 2 number a, b such that  a+b = 9   ab = 20

 

                    a = 4 & b= 5 will be the answer:

 

  X^2 + 9X + 20 = ( X +4 ) ( X +5)