Question

1 ) Dada a função f(x) = x² - 5x + 4, determine:

A ) f(2)

B ) f(-1)

C ) f(0)

2 ) Sendo f(x) = x² - 7x + c, encontre o valor de C para, f(1) = 4.


3 ) Dada a função f(x) = x² - 2x + 1, determine X para, f(x) = 0.​

Answer 1

$a) \: f(2) = {2}^{2} - 5 \times (2) + 4 \\ f(2) = 4 - 10 + 4 = - 2$

$b) \: f( - 1) = {( - 1)}^{2} - 5 \times ( - 1) + 4 \\ f( - 1) = - 1 + 5 + 4 = 8$

$c) \: f(0) = {0}^{2} - 5 \times 0 + 4 = 4$

$2) \: f(1) = {1}^{2} - 7 \times ( - 1) + c = 4 \\ 1 + 7 + c = 4 \\ c = 4 - 8 \\ c = - 4</p><p></p><p>$