Question

vcs conseguem resolver com o cálculo? e urgente...pfv

1) x2 - 10x + 16 = 0.

2) x2 - 18x + 81 = 0.


ajuda ai ​

Answer 1

1) x² - 10x + 16 = 0

DELTA = b² - 4ac

DELTA = (-10)² - 4 × 1 × 16

DELTA = 100 - 64

DELTA = 36

$x = \frac{ - b + - \sqrt{36} }{2 \times 1}$

$x = \frac{10 + - 6}{2}$

$x1 = \frac{10 - 6}{2}$

$x1 = \frac{4}{2}$

x' = 2

$x2 = \frac{10 + 6}{2}$

$x2 = \frac{16}{2}$

x'' = 8

S = { 2, 8 }

2) x² - 18x + 81 = 0

DELTA = b² - 4ac

DELTA = (-18)² - 4× 1× 81

DELTA = 324 - 324

DELTA = 0

$x = \frac{ - b + - \sqrt{0} }{2 \times 1}$

$x = \frac{18 + - 0}{2}$

$x1 = \frac{18 - 0}{2}$

$x1 = \frac{18}{2}$

x' = 9

$x2 = \frac{18 + 0}{2}$

$x2 = \frac{18}{2}$

x'' = 9

S = { 9 }