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(x+3y)(x-3y) + (x + 2y)² - (2x² - 5y²) =
= (x² - 3y²) + (x² + 4xy + 4y²) - (2x² - 5y²) =
= x² - 3y²+ x² + 4xy + 4y² - 2x² + 5y² =
= 4 x y + 6 y² =
= 4*√2*√8 + 6*(√8)² =
= 4*√16 + 6 * 8 =
= 4 * 4 + 48 = 16 + 48 = 64