Question

10. Sabendo que (foto acima),determine o valor de a.​

Answer 1

$a = {( - 2 + \frac{4}{5} ) }^{ - 2}$

$a = {( - \frac{ 2}{1} + \frac{4}{5} )}^{ - 2}$

$a = {( - \frac{ - 2 \times 5 + 4 \times 1}{1 \times 5}) }^{2}$

$a = {( - \frac{6}{5}) }^{ - 2}$

$a = {( - \frac{ 5}{6} )}^{2}$

$a = ( { \frac{5}{2} )}^{2}$

$a = \frac{ {5}^{2} }{ {6}^{2} }$

$a = \frac{25}{36} = 0.694$