SOLUTION: How do you fill in the blanks to these problems? 1. (x+5)(x+?)=x^2+8x+15 2. (y-?)(y+4)=y^2+3y-4

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: How do you fill in the blanks to these problems? 1. (x+5)(x+?)=x^2+8x+15 2. (y-?)(y+4)=y^2+3y-4      Log On


   

Question 1389: How do you fill in the blanks to these problems?
1.
(x+5)(x+?)=x^2+8x+15
2.
(y-?)(y+4)=y^2+3y-4
Answer by usyim88hk(158) About Me  (Show Source):
You can put this solution on YOUR website!
1) ?=3 because 5+3=8 and 5*3=15
2) ?=1 because -1+4=3 and -1*4=-4