Answer :

Answer:

a²-b²

(15)²- (^5)²

225 -5

=220

imdaksh001

Answer:

220

Explanation:

here we can use following identity:

(a + b)(a - b) = a² + b²

So,

(15 - √5)(15 + √5)

= (15)² - (√5)²

= 225 - 5

= 220

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