Question

Oblicz ale nie wiem o co chodzi bo nie mam treści

1. +2x+1=0
2. +2x-3=0
3. +5x+6=0

Answer 1

1.  Tu chyba zamaist y powinien byś x i dla x licze równanie 

x² + 2x + 1 = 0

(x + 1)² = 0 

x + 1 = 0

x = -1  

 odp. x = 1

2.

x² + 2x - 3 = 0

a = 1, b = 2, c = -3

Δ = b² - 4ac = 4 + 12 = 16

√Δ = 4

x1 = (-b - √Δ) / 2a = (-2 - 4) / 2 = -6/2 = -3 

x2 = (-b + √Δ) / 2a = (-2 + 4) / 2 = 2/2 = 1

odp. x = -3, x = 1 

 

3.

x² + 5x + 6 = 0

a = 1, b = 5, c = 6

Δ = b² - 4ac = 25 - 24 = 1

√Δ = 1

x1 = (-5 - 1) / 2 = -6/2 = -3

x2 = (-5 + 1) / 2 = -4/2 = -2

odp. x = -3, x = -2 

Answer 2

2)  x² + 2x - 3 =0

Δ=b² - 4ac = 4 + 12 = 16

√Δ=4

 

x1=(-b-√Δ)/2a = (-2 - 4) / 2  = -6/2=-3

x2=(-b+√Δ)/2a = (-2+4)/2 = 2/2=1

 

 

3)

x²+5x+6=0

Δ=25 - 24 = 1

√Δ=1

 

x1=(-5-1)/2 = -6/2=-3

x2=(-5+1)/2 = -4/2 = -2

1)  po konsultacji na pv, wiem ze powinien byc   x² ,a nie y²

x²+2x+1=0

Δ=4-4=0

x=(-b)/2a = -2/2=-1