Question

como resolver isto: - (+7 - 9)² =

Answer 1

- ( + 7 - 9 )² =
= - (2)² = - 4.
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Answer 2

$-(7-9)^{2}=-(-2)^{2}\\\\-(7-9)^{2}=-(4)\\\\\boxed{\boxed{-(7-9)^{2}=-4}}$