Question

A expressao [(-7)³ - (-7³)] - [(-7)² + 7²] resulta em

a) -784
b) -686
c) -98
d) -49

Answer 1

Hey there :)

[ ( - 7 )³ - ( - 7³ ) ] - [ ( - 7 )² + 7² ) ]
↓ ↓ ↓ ↓
[( - 343 ) - ( - 343 )] - [( 49 ) + ( 49 )]

Since there are brackets, according to the order of operations, we do perform them separately )

0 - [ 98 ]
- 98

Your answer will be option C) - 98

Answer 2

[(-7)³ - (-7³)] - [(-7)² + 7²]

= [(-343 - (- 343)] - [49 + 49 ]

= [-343 + 343] - [49 + 49 ]

= [0] - [98 ]

= -98 (Answer D)