kaurgagan059 kaurgagan059

11-08-2021
Mathematics

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Using the identity. (a - b) ²= (a² - 2ab + b²), evaluate 699²

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preetishrestha505 preetishrestha505

11-08-2021

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Аноним Аноним

11-08-2021

[tex]\\ \sf\longmapsto 699^2[/tex]

[tex]\\ \sf\longmapsto (700-1)^2[/tex]

[tex]\\ \sf\longmapsto 700^2-2(700(1)+(1)^2[/tex]

[tex]\\ \sf\longmapsto 490000-1400+1[/tex]

[tex]\\ \sf\longmapsto 488600+1[/tex]

[tex]\\ \sf\longmapsto 488601[/tex]

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