Rozwiąż równania:
a) 3x² + 10x + 3 = 0
b) -x²+ 3x + 4 = 0
c) 25x² - 10x + 1 = 0
Rozwiąż nierówności:
a) x² - 2x - 3 ≥ 0
b) 5x² + 10x - 15 < 0
c) -x² + 8x - 16 < 0
d) 4x² - 2x + 5 > 0
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załącznik
R R
a) delta = 10^2 - 4* 3*3
delta = 100 - 36
delta = 64 / pierwiastek
delta = 8
x1= -10-8/ 2*3 x2= -10+8/2*3
x1= -18/6 x2= -2/6
x1= -3 x2= -1/3
odp. x1=-3 , x2= -1/3
b)
delta= 3^2 - 4*(-1) *4
delta = 25/pierw.
delta= 5
x1= -3-5/2*-1 x2 = -3+5/-2
x1= 4 x2= -1
odp. x1=4 x2=-1
c) delta= (-10)^2 -4*25*1
delta= 100-100
delta=0
x0= 10/2*25
x0= 1/5
odp x0=1/5
RN
a)
x²-2x-3>0
Δ=(-2)²-4*1*(-3)=4+12=16
√Δ=4
x₁=(2+4)/2=6/2=3
x₂=(2-4)/2=-2/2=-1
x∈(-∞,-1)∨(3,∞)
b) delta = 10^2 -4 *5* -15
delta= 100+300/pierwiastek
delta= 20
x1= -10-20/ 2*5 = -30/10=-3
x2= -10+20/2*5= 10/10= 1
x∈ ( -∞ , -3) v (1,∞)c) delta= 8^2 -4*-1*-16= 64-64delta=0x0= -8/ 2*-1= 4 x∈ ( 4 ∞)