Rozwiąż równanie kwadratowe:
a) x(kwadrat)-5=0
b) (x+5)(x-5)=24
c) 3x(kwadrat)- 9\4x=0
d) x(kwadrat)-1\x = 7\12
e) x(kwadrat)+5x+8=0
f) 4x(do szescianu)+7x(kwadrat)-2=0
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a) 2x kwadrat + 7x + 3 = 0
delta = 49 - 4*2*3
delta = 49-24
delta= 25
pierwiastek z delty = 5
x1 = -7-5/4 = -12/4 = -3
x2=-7+5/4 = -2/4 = -1/2
b) 12xkwadrat + 11x + 2 = 0
delta= 121 - 4*12*2
delta= 121-96
delta=25
pierwiastek z delty=5
x1= -11-5/24 = -16/24 = -2/3
x2= -11+5/24 = -6/24= -1/4
c) delta= 169 - 4*-6*5
delta= 169+120
delta=49
pierwiastek z delty=7
x1=-13-7/-12 = -20/-12 = 5/3
x2= =13+7/-12= 6/-12= -1/2