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b. (x + √x)(x + √x) = x² + x√x + x√x + x = x² +2x√x + x
c. (3x + 2y)(x - y) = 3x² - 3xy + 2xy - 2y² = 3x² - xy + 2y²
d. (4l + 4y)( l - y) = 4l² -4ly +4ly - 4y² = 4l² - 4y²
e. *pikir sendiri ya... :D