(- 1, 4)
(1, 7)
D.
If a, b and n are natural numbers, then a2n - 1 + b2n - 1 is divisible by
a + b
a - b
a3 + b3
a2 + b2
If a, b, c and d ∈ R such that a2 + b2 = 4 and and if (a + ib) = (c + id)2 (x + iy), then x2 + y2 is equal to
4
3
2
1