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b. (-x)² + 2.(-x).(8) + (8)² = x² - 16x + 64
c. (2x)² + 2.(2x).(-2y) + (-2y)² = 4x² - 8xy + 4y²
d. (-1/2x)² + 2.(-1/2x).(3/4) + (3/4)² = 1/4x² - 3/4x + 3/8
= 4x² +20x +25
b) =x² -8x -8x +64
= x² -16x +64
c) = 4x² -4xy -4xy +4y²
= 4x² -8xy +4y²
d) = x² - x -x +4
=x² -2x +4