Question

1)Resuelve:. N = (x + 4) ^2 - ( x - 7) ^2 =

Answer 1

(x + 4) ^2 - (x - 7)^2=

x² + 4² - x² - 7² =

x² - x² = 7² - 4²

x= 49 - 16

x = 30