Question

Cat face 2 la puterea -2?

Answer 1

1/2 la puterea 2 adica 1/4

Answer 2

$\it 2^{-2}= \left (\dfrac{2}{1} \right)^{-2} =\left[\left (\dfrac{2}{1} \right)^{-1}\right]^2 = \left (\dfrac{1}{2} \right)^{2} = \dfrac{1^2}{2^2} =\dfrac{1}{4}$