tolong di jawab ya...

3a) (x + y)(x - y) = x² - y²
pembuktian
(x + y)(x - y) = (8 + 3)(8 - 3) = 11 × 5 = 55
x² - y² = (8)² - (3)² = 64 - 9 = 55
pernyataan benar

b) (x + y)² = x² + y²
pembuktian
(x + y)² = (7 + 4)² = 11² = 121
x² + y² = 7² + 4² = 49 + 16 = 65
pernyataan salah

c) (x - y)² = x² - y²
pembuktian
(x - y)² = (6 - 2)² = 4² = 16
x² - y² = 6² - 2² = 36 - 4 = 32
pembuktian salah

d) (x + y)² = x² + 2xy + y²
(x + y)² = (2 + 5)² = 7² = 49
x² + 2xy + y² = 2² + 2.2.5 + 5² = 4 + 20 + 25 = 49
pembuktian benar