Question

Seja f a função de R em R definida por f(x) = x² - 3x + 4, Calcular:
a) f (√3)
c) f (1 - √2)

Answer 1

$f(x) = x^2-3x+4\\\\\\ a)~~f( \sqrt{3}) \\\\ (\sqrt{3})^2-3(\sqrt{3})+4 \to~~~ 3-3\sqrt{3}+4\to~~~\boxed{~-3\sqrt{3}+7~} ~~~~ ou:\\\\ -3*1,73+7\to~~~-5,19+7\to~~~\boxed{~1,81~}$



$b)~~f( 1-\sqrt{2}) \\\\ ( 1-\sqrt{2})^2-3( 1-\sqrt{2})+4 \to~~~ 1-2-3+3\sqrt{2}+4\to~~~\boxed{~3\sqrt{2}~}~~ou: \\\\ 3*1,41\to~~~\boxed{~4,23~}$