Question

Equação de 2°Grau help
x2 - 7x - 10 = 0
e
x2 + 2x - 3 = 0

Answer 1

a= 1.

b=2

c=-3

Δ = b² -4.a.c

Δ = 2²-4.1.-3

Δ= 4+12

Δ= 16

X= -b ± √Δ

2.a

x= -2±√16

2.1

X= -2± 4

2

X1= -2-4

2

X1= -6. X1=-3

2

X2=-2+4. X2= 2 X2= 1

2. 2

Answer 2

A) x² - 7x - 10 = 0
A= 1
B= - 7
C= - 10

∆= b² - 4ac

∆= (-7)² - 4 . 1 . (-10)
∆= 49 + 40
∆= 89

x= - b ± √∆/2a

x= - (-7) ± √89 / 2 . 1
x= 7 ± √89 / 2

x' = 7 + √89/2
x''=7 - √89/2

S= ( 7 + √89/2 , 7 - √89/2)

B) x² + 2x - 3 = 0

A= 1
B= 2
C= - 3

∆= b² - 4ac

∆= 2² - 4 . 1 . (-3)
∆= 4 + 12
∆= 16

x= - b ± √∆ /2 . a

x= - 2 ± √16 / 2 . 1
x= - 2 ± 4 / 2

x' = - 2 + 4/2 = 2/2 = 1
x''= - 2 - 4/2 = -6/2 = - 3

S= ( 1 , - 3)