SOLUTION: Two numbers multiplied together give -15 But added together they give -2

Algebra ->  Rational-functions -> SOLUTION: Two numbers multiplied together give -15 But added together they give -2       Log On


   

Question 991965: Two numbers multiplied together give -15 But added together they give -2
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
A%2AB=-15
A%2BB=-2
From the first,
A=-15%2FB
Substituting,
-15%2FB%2BB=-2
-15%2BB%5E2=-2B
B%5E2%2B2B-15=0
%28B%2B5%29%28B-3%29=0
Two solutions:
B%2B5=0
B=-5
Then,
A-5=-2
A=3
and
B-3=0
B=3
Then,
A%2B3=-2
A=-5