landmar04 landmar04

03-07-2018
Mathematics

contestada

Which number should be multiples to obtain 165^2-123^2

Respuesta :

03-07-2018

The identity in question is called the difference of two squares:

[tex]a^2 - b^2 = (a+b)(a-b)[/tex]

So

[tex]165^2-123^2=(165+123)(165-123)=288\times 42[/tex]

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