Answer:
3x^2+27y^2-18xy
Explanation:
3(x-3y)^2
3 [(x-3y)(x-3y)]
3 [x^2-3xy-3xy+9y^2]
3 [x^2-6xy+9y^2]
open d bracket
3x^2-18xy+27y^2
rearrange
3x² - 18xy + 27y²
= 3 ( x - 3y )²
= 3 ( x² - 2 * -3y * x + ( -3y)²)
= 3( x² - 6xy +9y²)
= 3x² - 18xy + 27y²
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