Question

using Identilies, evaluate
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Answer 1

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(i)

$10.5 \times 9.5$

$(10 + 0.5)(10 - 0.5)$

( a + b )( a - b ) = a² - b²

${(10)}^{2} - {(0.5)}^{2}$

$100 - 0.25$

$99.75$

(ii)

${(5.1)}^{2}$

${(5 + 0.1)}^{2}$

( a + b )² = a² + 2ab + b²

${(5)}^{2} + 2(5)(0.1) + {(0.1)}^{2}$

$25 + 1 + 0.01$

$26.01$

Answer 2

answer: hope it will help you.

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