If a2 + b2 = 13 and ab = 6, find
(i) a + b
(ii) a - b
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If 3x - 4y = 16 and xy = 4, find the value of 9x2 + 16y2.
If x + y = 8 and x - y = 2, find the value of 2x2 + 2y2.
If a + b = 4 and ab = -12, find
(i) a - b
(ii) a2 - b2.
If p - q = 9 and pq = 36, evaluate
(i) p + q
(ii) p2 - q2.