If (a - b) = 0.9 and ab = 0.36, find the values of :
(i) (a + b).
(ii) (a2 - b2).
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If (3a + 4b) = 16 and ab = 4, find the value of (9a2 + 16b2).
If (a + b) = 2 and (a - b) = 10, find the values of :
(i) (a2 + b2)
(ii) ab