1.

( 5x​ + 3y​^2) (5x​ - 3y​^2)

Answer»

(5X - 3Y + 2) (5x + 3y + 2)

LET 5x + 2 be a.

= (a - 3y)(a + 3y)

= a² - (3y)²

= (5x + 2)² - 9y²

= 25x² + 20X + 4 - 9y²



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