The Total solution for NCERT class 6-12
a + b = 7, ab = 12Squaring both sides,(a + b)2 = (7)2⇒ a2 + b2 + 2ab = 49⇒ a2 + b2 + 2 x 12 = 49⇒ a2 +b2 + 24 = 49⇒ a2 +b2 = 49 – 24 = 25∴ a2 +b2 = 25