Question

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Answer 1

Explicación paso a paso:

$( {55}^{2} - {15}^{2} ) = (55 - 15) \times (55 + 15) = 40 \times 70 = 2800$

$( {999}^{2} - 1) = (999 - 1) \times (999 + 1) = 998 \times 1000 = 998000$

$( {97}^{2} - 9) = (97 - 3) \times (97 + 3) = 94 \times 100 = 9400$