Question

please solve completely

Answer 1

just put the value of x as x=19 in the rhs of the given equation

Answer 2

Final Answer :2470

Put x = 19 in given equation.

We get,
${1}^{2} + {2}^{2} + {3}^{2} + .... + {19}^{2} = \\ \frac{19 \times (2 \times 19 + 1) \times (19 + 1)}{6} \\ = > \frac{19 \times 39 \times 20}{6} = > 2470$