Question

plz help plz plz plz plz​

Answer 1

Answer:

89

Step-by-step explanation:

The Given Equation is;

  $(\frac{1}{3} )^{-2} +(\frac{1}{5} )^{-2} +(\frac{1}{7} )^{-2}$

= $\frac{1^{-2} }{3^{-2} } +\frac{1^{-2} }{5^{-2} } +\frac{1^{-2} }{7^{-2} }$

= $\frac{\frac{1}{1^{2}} }{\frac{1}{3^{2}} } +\frac{\frac{1}{1^{2}} }{\frac{1}{5^{2}} } +\frac{\frac{1}{1^{2}} }{\frac{1}{7^{2}} }$

= $\frac{1}{1^{2}} /\frac{1}{3^{2} } +{\frac{1}{1^{2}} / {\frac{1}{5^{2}} } +{\frac{1}{1^{2}} /\frac{1}{7^{2}}$

= $\frac{1}{1^{2}} *\frac{3^{2}}{ 1 } +{\frac{1}{1^{2}} * {\frac{5^{2}}{1} } +{\frac{1}{1^{2}} *\frac{7^{2}}{1}$

= $3^{2} +5^{2} +7^{2}$

= $9+25+49$

= $89$        (Ans)

Hope you have understood the process...        

(IF you find the answer helpful, please make my answer as Brainliest.)

By- Md. Mominur Islam Mahim.