Question

(215)²-(205)² evaluate by using identity ....​

Answer 1

Step-by-step explanation:

We know (a)square -(b) square=(a+b)(a-b)

so, (215+205)(215-205)

=420*10

=4200

Answer 2

According to a² - b² identity , [ a² - b² = a² - 2ab + b² ]. , we get

$\huge \tt \: 100$

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