So we need to find values for a, b and c in one of the following examples:
(1) a2+bc=9: example: a=1, b=2, c=4 so the expression is 12+2×4=9
(2) ab2+c=9: example: a=1, b=2, c=5 so the expression is 1(22)+5=9
(3) c(a2+b)=9: example: a=2, b=1, c=1.8 so the expression is 1.8(22+1)=9
And there are many other examples.