Răspuns:
Explicație pas cu pas:
f(x) = -2x + a/2
A(2; -1)
f(2) = -1
-2*2 + a/2 = -1
-4 + a/2 = -1
a/2 = 4 - 1 = 3
a = 2*3 = 6
_____________
f(x) = -2x + 6/2
f(x) = -2x + 3
x = n; f(x) = 1/n
f(n) = 1/n
-2n + 3 = 1/n
-2n^2 + 3n = 1
2n^2 - 3n + 1 = 0
Δ = 9 - 8 = 1
n1 = (3 + 1)/4 = 1
n2 = (3 - 1)/4 = 2/4 = 1/2
B(1; 1) si C (1/2; 2)
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Răspuns:
Explicație pas cu pas:
f(x) = -2x + a/2
A(2; -1)
f(2) = -1
-2*2 + a/2 = -1
-4 + a/2 = -1
a/2 = 4 - 1 = 3
a = 2*3 = 6
_____________
f(x) = -2x + 6/2
f(x) = -2x + 3
x = n; f(x) = 1/n
f(n) = 1/n
-2n + 3 = 1/n
-2n^2 + 3n = 1
2n^2 - 3n + 1 = 0
Δ = 9 - 8 = 1
n1 = (3 + 1)/4 = 1
n2 = (3 - 1)/4 = 2/4 = 1/2
B(1; 1) si C (1/2; 2)