Question

If a+b+c=9 and ab+BC+ca=40,find the value of a2+b2+c2. class 9 maths

Answer 1

${a}^{2} + {b}^{2} + {c}^{2} = 1$

Answer 2

We Know that....

(a+b+c)^2=a^2+b^2+c^2+2ab+2bc+2ca

so by putting the values...

9^2=a^2+b^2+c^2+40

or ...

a^2+b^2+c^2=81-40

=41