let x represent our age, b brothers age, s sisters age.
if brother is three years older than us,
x+3=b
if sister is four years younger than us,
x-4=b
the product of all three ages is 1872:
x*b*s=1872
substitute now b and s
x*b*s=1872
x(x+3)(x-4)=1872
(x^2+3x)(x-4)=1872
x^3-4x^2+3x^2-12x=1872
x^3-2^x-12x=1872
subtract 1872 from both sides
x^3-x^2-12x-1872=0
on the graph we can see that the only real solution is 13
x=13
b=3+13
m=16
s=x-4
s=13-4
s=9
Our age is 13, brothers age is 16 and sisters age is 9
the correct answer is (A)
plz mark me as brainliest if this helped :)
