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4x2 – xy + 4y2 4(x2 + y2) – xy 4[(x + y)2 – 2xy] – xy 4(x + y)2 – 9xy ……..(1) x + y = [(√13 + √12)/(√13 - √12)] + [(√13 - √12)/(√13 + √12)] = [(√13 + √12)2 + (√13 - √12)2]/((√13)2 - (√12)2) = [13 + 12 + 2(√13)(√12) + 13 + 12 - 2(√13)(√12)]/2 = 25 xy= [(√13 + √12)/(√13 - √12)][(√13 - √12)/(√13 + √12)] = 1 From eq (1) => 4(25)2 - 9 = 2491
If 10 9 38 x 5428
Then, 2x² + 1 = ?
...13 24 75 134 447 892
...11 33 66 112 173 ? .
3 5 7 25 8...
The series given below contains a sequence of numbers. Accordingly identify the incorrect number.
85, 84, 81, 88, 77, 92, 72
40 41 86 ? 1084 5445
...12 11 21 62 ? 1234
Direction: Which of the following will replace ‘?’ in the given question?
10, 12, ‘?’, 27, 36, 45, 54, 63, 72
112 162 199 ? 242 252
...6 16 116 566 2272 6814
11 a�...