Question

resolver: $( \frac{4}{7} + 5) ( \frac{4}{7} - 2) - ( \frac{4}{7} + 5) ^{2}$
-no borren este post, necesito esto urg¡

Answer 1

$(\frac{4}{7}+5)( \frac{4}{7}-2)-( \frac{4}{7}+5) ^{2}$
$=( \frac{4}{7}+ \frac{5}{1} . \frac{7}{7})( \frac{4}{7}- \frac{2}{1}. \frac{7}{7})-( \frac{4}{7}+ \frac{5}{1}. \frac{7}{7})<span>^{2} </span>$
$=( \frac{4}{7}+ \frac{35}{7})( \frac{4}{7}- \frac{14}{7})-( \frac{4}{7}+ \frac{35}{7}) ^{2}$
$=( \frac{39}{7})( \frac{-10}{7})-( \frac{39}{7}) ^{2}$
$= \frac{-390}{49}- \frac{1521}{49}$
$= \frac{-1 . 390-1 . 1521}{49}$
$= \frac{-1911}{49}$
$=-39$