Question

evaluate using identities 2.5×19.5​

Answer 1

Step-by-step explanation:

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Answer 2

20.5 * 19.5 = 399.75

Step-by-step explanation:

Correct Question would be

20.5 * 19.5

= (20 + 0.5)(20 - 0.5)

Using identity

(a + b)(a - b) = a² - b²

a = 20

b = 0.5

= 20² - 0.5²

= 400  - (5/10)²

= 400 - 25/100

= 400 - 0.25

= 399.75

20.5 * 19.5 = 399.75

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