Question

-16 la puterea 21 - 8 la puterea 28

Answer 1

$(- 16) {}^{21} = - (16) {}^{21} = - ( 2 {}^{4} ) {}^{21} = \\ \\ = - 2 {}^{4 \times 21} = - {2}^{84}$

$8 {}^{28} =( 2 {}^{3} ) {}^{28} = {2}^{3 \times 28} = {2}^{84}$

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$( - 16) {}^{21} - 8 {}^{28} = \\ \\ = - 2 {}^{84} - 2 {}^{84} =- 2 {}^{84} \times 2 = \\ \\ = - 2 {}^{84 + 1} =\boxed{ - {2}^{85}}$

Answer 2

Ai răspuns atașat pe foaie.