Question

By using a²-b² = (a + b) (a - b), evaluate the following 8.7x9.3​

Answer 1

Given: 9.3 × 8.7

= (9 + 0.3) (9 - 0.3)

= (9)² - (0.3)²

= 81 - 0.09

= 80.91

Answer: 80.91

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Answer 2

Answer:

Now,

Take ,

$8.7 = 9 - 0.3 \\ and \: 9.3 = 9 + 0.3 \\ </p><p>Let's \: \: take, a=9 \: and \: \: b=0.3.$

Substitute the values,

$(a + b)(a - b) = a^{2} - b^{2} \\ (9 + 0.3)(9 - 0.3) = {9}^{2} - {0.3}^{2} \\ (9.3)(8.7) = 81 - 0.09 \\ (9.3)(8.7) = 80.91</p><p>$

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