what numbers add to -11 but multiply to equal 21

Question

please help me i need to know this.

Answer 1

no. one = x

no. two = y

 

numbers add to -11

x+y =-11   

 

multiply to equal 21

(x)(y) = 21

 

x+y =-11

x =-11-y

 

(x)(y) =21

(-11-y)(y) =21

-11y -y² =21

 

y² +11y+21 =0

 

solve this equation and find 2 no.