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Mathematics

Grade10

Easy

Question

Find the product. 91²

8281
8761
8161
8521

The correct answer is: 8281

Using the pattern (a + b)² = a² + 2ab + b²,
91² = (90 + 1)² = 90² + 2 $cross times$ 90 $cross times$ 1 + 1² = 8100 + 180 + 1 = 8281

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