Question

considerando a função f(x) = x2 - 4 / x + 2, qual o seu valor para x = 2,9?

Answer 1

$\displaystyle \sf f(x) = \frac{x^2-4}{x+2} \\\\\\ f(x) = \frac{x^2-2^2 }{x+2} \\\\\\ f(x) = \frac{(x+2)(x-2)}{x+2} \\\\\\ f(x) = x- 2 \\\\ x = 2,9 \\\\ f(2,9) = 2,9-2 \\\\ \boxed{\sf f(2,9) = 0,9 \\\\ }\checkmark$