1.

25x2 - 90xy + 81y by using appropriate identities​

Answer»

Answer:

Step-by-step explanation:

25 = 5^2

81=9^2

ok?

now, back to the question

25x2 - 90xy + 81y

= (5x)^2 + (9y)^2 - 2*45 xy

now, 45 = 5 * 9, RIGHT?

= (5x)^2 + (9y)^2 - 2*5*9 xy

by a^2 + b^2 -2ab = (a-b)^2

=> (5x - 9y)^2

hope it helped,

please MARK as brainliest if it did


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