Question

if a + b + c = 9 and ab + BC + CA= 40 then find a^2 + b^2 + c^2

Answer 1

square both sides in the a + b + c = 9 and then put the values of ab + bc + ca by taking the common 2 in the derived equation then you will get your answer

Answer 2

ur answeer is this
hope it will hlp