Fie ecuatia [tex] \left|\begin{array}{ccc} x^{2} -1&1\\x&4\\\end{array}\right|[/tex]=[tex]5 \left|\begin{array}{ccc}x&x-1\\2&x\\\end{array}\right| \left [/tex] cu solutiile x1,x2, x1<x2. Daca α=7[tex] x_{1} ^{2} -2 x_{2} ^{2} [/tex], atunci:
a)α=28
b)α=-70
c)α=-98
d)α=70