Question

Прошу, решите эти примеры, очень надо

Answer 1

$(a - 1)(a + 1) = {a}^{2} - 1 \\ (3c + 6b) {}^{2} = (3c) {}^{2} + 2 \times 3c \times 6b + (6b) {}^{2} = 9 {c}^{2} + 36cb + 36b {}^{2} \\ (x - 1.5) {}^{2} = {x}^{2} - 2 \times 1.5 \times x + (1.5) {}^{2} = {x}^{2} - 3x + 2.25$