Question

calcule as raízes das equação do 2° grau
${x}^{2} - 100$
${x}^{2} - x - 2$
​

Answer 1

A) x² - 100 = 0

x²= 100

x= ± √100

x= ± 10

S= ( 10 , - 10)

B) x² - x - 2 = 0

A= 1

B= - 1

C= - 2

∆= b² - 4ac

∆= ( - 1)² - 4 • 1 • ( - 2)

∆= 1 + 8

∆= 9

x= - b ± √∆ /2a

x= - (-1) ± √9/2 • 1

x= 1 ± 3/2

x'= 1 + 3/2 = 4/2 = 2

x''= 1 - 3/2 = - 2/2 = - 1

S= ( - 1, 2)

Answer 2

a -

x² -100 = 0

x² = 100

x = ±√100

x' = 10

x" = -10

b -

x² -x -2 = 0

( x -2).( x +1) = 0

x' = 2

x" = -1

Dúvidas só perguntar!