Question

calcule o valor de:
${649}^{2 } - {648}^{2} .$
${985}^{2} - {983}^{2}$

Answer 1

$649 {}^{2} - {648}^{2} \\ (649 - 648) \times (649 + 648) \\ 1 \times 1297 = 1297$
$({985})^{2} - ( {983})^{2} \\ (985 - 983) \times (985 + 983) \\ 2 \times 1968 = 3936$