Question

dada a função y=4x-x² determine a vertice da função

Answer 1

Olá novamente, tudo bem?

$V=\left(-\dfrac{b}{2a};\,\,-\dfrac{\Delta}{4a}\right)\to\\\\\\V=\left(-\dfrac{4}{2\times (-1)};\,\,-\dfrac{16}{4\times (-1)}\right)\to\\\\\\V=\left(\dfrac{-4}{-2}};\,\,\dfrac{-16}{-4}\right)\to\boxed{V=(2;\,\,4)}$

É isso! :)