( 5x + 3y^2) (5x - 3y^2)
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(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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