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(4x - 5)² + (5 + 4x)² = 16x² - 40x + 25 + 25 + 40x + 16x² = 32x² + 50
b)
(2x -1)² - 4(x - 3)(x + 3) = 4x² - 4x + 1 - 4(x² - 9) = 4x² - 4x + 1 - 4x² + 36 =
= -4x + 37
c)
(x + 2y)² - (x + 2y)(x - 2y) + 2(x - 2y)² + 4xy =
= x² + 4xy + y² - (x² - 4y²) + 2(x² - 4xy + 4y²) + 4xy =
= x² + 4xy + y² - x² + 4y² + 2x² - 8xy + 8y² + 4xy = 2x² + 16y²