Question

Q 5. Find the values of the following by using proper identity : ( 8 )

1. ( 52 )²
2. ( 78 )²

3. 63 × 57

4. 46 × 54

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Answer 1

Answer:

1. (50+2)²

(50)² + (2²) + (2×2×50)

2500 + 4 + 200

2704.