Math, asked by ishan14y, 1 year ago

how it is done? please tell me step by step.

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Answered by raguld

2

Step-by-step explanation:

=√((28^2)-(21^2))

Using (A^2-B^2)= (A+B)(A-B) formula

= √((28+21)(28-21))

= √(49x7)

= 7√7

hope you understood

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