The Total solution for NCERT class 6-12
a + b + c = 9, ab + bc + ca = 23Squaring,(a + b+ c) = (9)2a2 + b2 + c2 + 2 (ab + bc+ ca) = 81⇒ a2 +b2 + c2 + 2 x 23 = 81⇒ a2 + b2+ c2 + 46 = 81⇒ a2 + b2+ c2 = 81 – 46 = 35 (a)