Arthur D. answered 11/12/17
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48=2*2*2*2*3
2*2*2*2=16
3*16=48
-16*3=-48 and -16+3=-13
if you need algebra...
x+y=-13
x*y=-48
y=-13-x
x*(-13-x)=-48
-13x-x^2=-48
x^2+13x-48=0
factor
(x+16)(x-3)=0
x+16=0
x=-16
x-3=0
x=3