a) (p-2)² + 3p² = p² - 4p + 4 + 3p² = 4p² - 4p + 4б) 81x² - (9x + 7y)² = 81x² - 81x² - 126xy - 49y² = -126xy - 49y²в) c(2c - 1)² = c(4c² - 4c + 1) = 4c³ - 4c² + cг) -4(p - 2a)² = -4(p² - 4ap + 4a²) = -4p² + 16ap - 16a²д) a(a - 7) + (a + 3)² = a² - 7a + a² + 6a + 9 = 2a² - a + 9
a) (p-2)² + 3p² = p² - 4p + 4 + 3p² = 4p² - 4p + 4
б) 81x² - (9x + 7y)² = 81x² - 81x² - 126xy - 49y² = -126xy - 49y²
в) c(2c - 1)² = c(4c² - 4c + 1) = 4c³ - 4c² + c
г) -4(p - 2a)² = -4(p² - 4ap + 4a²) = -4p² + 16ap - 16a²
д) a(a - 7) + (a + 3)² = a² - 7a + a² + 6a + 9 = 2a² - a + 9