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= x² - 4xy + 4y²
2). Maaf, Tidak Tau saya.
3). (2x + 7)(5x - 6) = 10x² - 12x + 35x - 42 =
10x² + 23x - 42
Konstanta = -42
4). 9x(3x + 4) = (9x × 3x) + (9x × 4) =
27x² + 36x
5). 2(x + 3) + 4(x - 2) = 2x + 6 + 4x - 8 =
6x - 2