Witam, 2 przykładziki rownan kwadratowych
a) 2(4-t)^2=t+2
b)2/3(a+1)+a^2=1,5(1-a)
Pozdrawiam =]
a) 2(16 - 8t +t^2) = t + 2
32 - 16t +2t^2 -t -2 = 0
2t^2 -17t +30 = 0
delta = 289 -120 = 169
pierwiastek z delty = 13
t1 = (17 - 13) : 4 v t2 = (17 + 13) : 4
t1 = 1 v t2 = 30/4
t2 = 15/2
b) 2/3 (a+1) +a^2 = 1.5(1-a)
2/3a +2/3 + a^2 = 3/2 - 3/2a
2/3a + 2/3 + a^2 -3/2 +3/2a = 0
a^2 + 4/6a + 9/6a + 4/6 - 9/6 = 0
a^2 + 13/6a - 5/6 = 0
delta = 169/36 + 4 * 5/6 = 169/36 + 20/6 = 169/36 + 120/ 36 = 289/36
pierwiastek z delty = 17/6
a1 = (-13/6 + 17/6) : 2 v a2 = (-13/6 - 17/6) : 2
a1 = 4/6 :2 v a2 = -30/6 :2
a1 = 1/3 v a2 = -5/2
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a) 2(16 - 8t +t^2) = t + 2
32 - 16t +2t^2 -t -2 = 0
2t^2 -17t +30 = 0
delta = 289 -120 = 169
pierwiastek z delty = 13
t1 = (17 - 13) : 4 v t2 = (17 + 13) : 4
t1 = 1 v t2 = 30/4
t2 = 15/2
b) 2/3 (a+1) +a^2 = 1.5(1-a)
2/3a +2/3 + a^2 = 3/2 - 3/2a
2/3a + 2/3 + a^2 -3/2 +3/2a = 0
a^2 + 4/6a + 9/6a + 4/6 - 9/6 = 0
a^2 + 13/6a - 5/6 = 0
delta = 169/36 + 4 * 5/6 = 169/36 + 20/6 = 169/36 + 120/ 36 = 289/36
pierwiastek z delty = 17/6
a1 = (-13/6 + 17/6) : 2 v a2 = (-13/6 - 17/6) : 2
a1 = 4/6 :2 v a2 = -30/6 :2
a1 = 1/3 v a2 = -5/2