If x2 + y2 = 9 and xy = 8, then x + y is equal to
25
5
-5
±5
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If the sum and the product of two numbers are 8 and 15 respectively, find the sum of their cubes.
(102)2 - (98)2 is equal to
200
400
600
800
96 × 104 is equal to
9984
9974
9964
none of these