The Total solution for NCERT class 6-12
a2 + b2 + c2 = 250, ab + bc +ca = 3(a+ b + c)2 = a2 + b2 + c2 +2(ab + bc +ca)= 250+ 2 x3 =250 + 6 = 256=(±16)2∴ a + b + c = ±16