Question:
397 x 397 + 104 x 104 + 2 x 397 x 104 = ?
[A].250001
251001
260101
261001
397 x 397 + 104 x 104 + 2 x 397 x 104 = ?
[A].
[B].
[C].
[D].
Answer: Option B
Explanation:
| Given Exp. | = (397)2 + (104)2 + 2 x 397 x 104 |
| = (397 + 104)2 | |
| = (501)2 = (500 + 1)2 | |
| = (5002) + (1)2 + (2 x 500 x 1) | |
| = 250000 + 1 + 1000 | |
| = 251001 |