Question

Q.3. Expand :
(m +2/3) ( m-2/3)
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Answer 1

(m+2/3)(m-7/3)

m*m-7/3m+2/3m-14/9

m²-5/3m-14/9

verified answer

Answer 2

Answer:

m² - 4/9

Step-by-step explanation:

Method 1

(m + 2/3) (m - 2/3)

= (m × m) + (m × -2/3) + (2/3 × m) + (2/3 × -2/3)

= m² - 2m/3 +  2m/3 - 4/9

= m² - 4/9

Method 2

(m + 2/3) (m - 2/3)

= (m)² - (2/3)²      (∵ (a + b) (a - b) = a² - b²)

= m² - 4/9

Hope that helps you...☺