Răspuns:
6x + 3x - 4x = 5x
3a(a - 2) = 3a² - 6a
(a + 1)(a + 3) = a² + a + 3a + 3 = a² + 4a + 3
(a + 3)² = a² + 6a + 9
(x - 4)² = x² - 8x + 16
(3x + 2)² = 9x² + 12x + 4
(2x - 3)² = 4x² - 12x + 9
(3x - 4)(3x + 4) = 9x² - 16
(√3 + 1)² = 3 + 2√3 + 1 = 4 + 2√3
(√5 - 2)² = 5 - 4√5 + 4 = 9 - 4√5
(√10 - √7)(√10 + √7) = 10 - 7 = 3
4x² + 7x = x(4x + 7)
a³ - 5a² + a - 5 = a²(a -5) + (a - 5) = (a² + 1)(a - 5)
9x² - 12x + 4 = (3x - 2)²
16a² - 25b² = (4a - 5b)(4a + 5b)
