kaurgagan059
kaurgagan059 kaurgagan059
  • 11-08-2021
  • Mathematics
contestada

Using the identity (a + b) (a - b) = a - b², evaluate 49 × 51.​

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Аноним Аноним
  • 11-08-2021

[tex]\\ \sf\longmapsto 49\times 51[/tex]

[tex]\\ \sf\longmapsto (50-1)(50+1)[/tex]

[tex]\\ \sf\longmapsto (50)^2-(1)^2[/tex]

[tex]\\ \sf\longmapsto 2500-1[/tex]

[tex]\\ \sf\longmapsto 2499[/tex]

Answer Link
Аноним Аноним
  • 12-08-2021

49 × 51

Using Identity

  • (a + b) (a - b) = a - b²

Solution

⇛(50 + 1) (50 - 1)

⇛(50)² - (1)²

⇛2500 - 1

⇛2499

Answer Link

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