Question

evaluate this 8.6^2-1.4^2 using suitable identities
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Answer 1

Answer:

a² - b² = (a-b)(a+b)

8.6² - 1.4² = (8.6 - 1.4)(8.6 + 1.4)

= (7.2)(10) = 72

= 72

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Answer 2

Answer:

72 mark

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Step-by-step explanation:

a² - b² = (a-b)(a+b)

8.6² - 1.4² = (8.6 - 1.4)(8.6 + 1.4)

= (7.2)(10) = 72

= 72