Simplify the following using the formula: (a – b) (a + b) = a2 – b

1.	Simplify the following using the formula: (a – b) (a + b) = a2 – b2 :(1.8 × 2.2)
Answer» Given , 1.8 × 2.2 We can express 1.8 as 2 – 0.2 and 2.2 as 2 + 0.2 Using formula (a – b) (a + b) = a² – b² We get, 1.8 × 2.2 = (2 – 0.2) ( 2 + 0.2) = (2)² – (0.2)² = 4 – 0.04 = 3.96

Simplify the following using the formula: (a – b) (a + b) = a2 – b2 :(1.8 × 2.2)

Answer»

Given ,

1.8 × 2.2

We can express 1.8 as 2 – 0.2 and 2.2 as 2 + 0.2

Using formula (a – b) (a + b) = a² – b²

We get,

1.8 × 2.2

= (2 – 0.2) ( 2 + 0.2)

= (2)² – (0.2)²

= 4 – 0.04

= 3.96

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