Let a, b and c be real numbers such that
a^2 + ab + b^2 = 9
b^2 + bc + c^2 = 52
c^2 + ca + a^2 = 49.
Compute the value of (49b^2+39bc+9c^2)/a^2.
a^2 + ab + b^2 = 9
b^2 + bc + c^2 = 52
c^2 + ca + a^2 = 49.
Compute the value of (49b^2+39bc+9c^2)/a^2.