Question

A) X² - 25 = 0

B)X² - 9x = 0

Answer 1

Olá, Irukaitachi!

a) x² - 25 = 0

$x^2 = 25$
$x = \sqrt{25}$
$x = 5$

Logo:

$\boxed{\boxed{S = \{0, 5\}}}$

b) x² - 9x = 0

$x(x - 9) = 0$

Se falta o coeficiente c, temos $x' = 0$. Então:

$x - 9 = 0$
$x = 9$

Logo:

$\boxed{\boxed{S = \{0, 9\}}}$

Answer 2

A) X² - 25 = 0

x²= 0 + 25

x²= 25

x= ±√25

x= ± 5

S= ( 5 , - 5)

B)X² - 9x = 0

x • (x - 9) = 0

x= 0

x - 9 = 0

x= 0 + 9

x= 9

S= ( 0 , 9)