using identity, evaluate 8.9²
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Answer:
79.21
Step-by-step explanation:
= (8.9)²
= (9 - 0.1)²
= (9)² - 2(9)(0.1) + (0.1)²
= 81 - 1.8 + 0.01
= 81 - 1.79
= 79.21
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