Question

com cálculos!! pfv quero o cálculos pra a prova

Answer 1

$y = x^{2} - 7x + 10$

Para: $x = \frac{1}{2}$


$y = x^{2} - 7x + 10 \\ \\ y = ( \frac{1}{2}) ^{2} - 7. ( \frac{1}{2}) + 10 \\ \\ y = \frac{1}{4} - \frac{7}{2} + 10 \\ \\ y = \frac{1}{4} - \frac{7}{2} + \frac{10}{1} \\ \\ y = \frac{1 - 14 + 40}{4} \\ \\ y = \frac{41 - 14}{4}$

$y = \frac{27}{4}$


$y = x^{2} - 7x + 10$

Para y = 0

$y = x^{2} - 7x + 10 \\ \\ 0 = x^{2} - 7x + 10 \\ \\ x^{2} - 7x + 10 = 0$

a = 1
b = - 7
c = 10
Δ = $b^{2} - 4 . a . c$
Δ = $(- 7)^{2} - 4 . 1 . 10$
Δ = 49 - 40
Δ = 9

$x = \frac{- b (+ou-) \sqrt{delta}}{2 . a} \\ \\ x = \frac{- (- 7) (+ou-) \sqrt{9}}{2 . 1} \\ \\ x = \frac{7 (+ou-) 3}{2}$

$x' = \frac{7 + 3}{2} = \frac{8}{2} = 4 \\ \\ x" = \frac{7 - 3}{2} = \frac{5}{2}$



$y = x^{2} - 7x + 10$
Para y = 18