Question

Evaluate by using suitable identities
ii)1.8x2.2
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Answer 1

1.8×2.2= 18/10×22/10=(18×22)/100=396/100=3.96

3.96 is a answer

Answer 2

Answer:

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Step-by-step explanation:

1.8 x 2.2

= (2.0 - 0.2) (2.0 + 0.2)

= (2)² - (0.2)²   [  (a+b) (a-b) = a² - b²  ]

= 4 - 0.04

= 3.96