Question

Sa se efectueze :a)(-7supra 9 )la puterea a 2

Answer 1

$(\frac{-7}{9})^{2}=\frac{(-7)^{2}}{9^{2}}=\\</p><p>\\=\frac{49}{81}\\</p><p>\\ minus~la~putere~para~schimba~semnele\\</p><p>\\ Atentie!!!~(-7)^{2}=7^{2}~dar~-7^{2}=-49$