Question

Expand the number:(99)2​

Answer 1

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(99)² = (100−1)²

(100−1)² is of the form

(a−b)² = a² + b² − 2ab where a = 100, b = 1

∴ (100−1)² = 100² + 1² − 2 × 100 ×1

= 10000+1 − 200

= 10000 − 199 = 9801

Answer 2

Answer:

(90)+(9)2

Step-by-step explanation:

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