Question

Efetue
a)(2/7)^-2

b)(-3/4)^2

c)15^-2​

Answer 1

a) $(\frac{2}{7})^{-2} = \frac{7^{} }{2^{2} } = \frac{7}{4}$           b) $(-\frac{3}{4} )^{2} = (\frac{-3^{2} }{4^{2} } )=\frac{9}{16}$

c) $15^{-2} = (\frac{1}{15^{2} } ) = \frac{1}{225}$