Let k an even natural number, k ≥ 4. Solve in Z the equation: 11 ......... 121 = x^2. k-2 times b. Calculate, in two ways, the

Question

Let k an even natural number, k ≥ 4. Solve in Z the equation:
11 ......... 121 = x^2.
k-2 times
b. Calculate, in two ways, the determinant:
             bc              ca           ab
△ =  a(b +c)     b(c + a)   c(a+  b)
             a^2           b^2          c^2

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