Given that a + B + C = 12, the square of a + the square of B + the square of C = 60, find the value of AB + BC + Ca, and ask for the help of God

Given that a + B + C = 12, the square of a + the square of B + the square of C = 60, find the value of AB + BC + Ca, and ask for the help of God

(a + B + C) = a + B + C + 2Ab + 2Ac + 2BC = 12 = 144, substituting a + B + C = 60 into: 60 + 2Ab + 2Ac + 2BC = 144 2 (AB + BC + Ca) = 84 AB + BC + Ca = 42