Odpowiedź:
a) (x+1) (x+2) = x² + 2x + 1x + 2 = x² + 2 + 3x
a) (x+1) (x+2) = x² + 2x + 1x + 2 = x² + 2 + 3xb) (3a+4)(a-5) = 3a² + 15a + 4a - 20 = 3a² + 19a - 20
a) (x+1) (x+2) = x² + 2x + 1x + 2 = x² + 2 + 3xb) (3a+4)(a-5) = 3a² + 15a + 4a - 20 = 3a² + 19a - 20c) (2t + 1)(1 - 3t) = 2t - 6t + 1 - 3t = 6t² - 6 + 1
a) (x+1) (x+2) = x² + 2x + 1x + 2 = x² + 2 + 3xb) (3a+4)(a-5) = 3a² + 15a + 4a - 20 = 3a² + 19a - 20c) (2t + 1)(1 - 3t) = 2t - 6t + 1 - 3t = 6t² - 6 + 1d) (3ab - 7)(3 - 7ab) = 9ab + 21a²b² - 21 + 49ab = -21a²b² + 58ab - 21
a) (x+1) (x+2) = x² + 2x + 1x + 2 = x² + 2 + 3xb) (3a+4)(a-5) = 3a² + 15a + 4a - 20 = 3a² + 19a - 20c) (2t + 1)(1 - 3t) = 2t - 6t + 1 - 3t = 6t² - 6 + 1d) (3ab - 7)(3 - 7ab) = 9ab + 21a²b² - 21 + 49ab = -21a²b² + 58ab - 21e) (-x+y)(5x + 6y) = -5x² - 6xy + 5xy + 6y² = -xy - 5x² + 6y²
a) (x+1) (x+2) = x² + 2x + 1x + 2 = x² + 2 + 3xb) (3a+4)(a-5) = 3a² + 15a + 4a - 20 = 3a² + 19a - 20c) (2t + 1)(1 - 3t) = 2t - 6t + 1 - 3t = 6t² - 6 + 1d) (3ab - 7)(3 - 7ab) = 9ab + 21a²b² - 21 + 49ab = -21a²b² + 58ab - 21e) (-x+y)(5x + 6y) = -5x² - 6xy + 5xy + 6y² = -xy - 5x² + 6y²f) (x + 5y)(7x - y) = 7x² -xy + 35xy - 5y² = 7x² + 34xy - 5y²
a) (x+1) (x+2) = x² + 2x + 1x + 2 = x² + 2 + 3xb) (3a+4)(a-5) = 3a² + 15a + 4a - 20 = 3a² + 19a - 20c) (2t + 1)(1 - 3t) = 2t - 6t + 1 - 3t = 6t² - 6 + 1d) (3ab - 7)(3 - 7ab) = 9ab + 21a²b² - 21 + 49ab = -21a²b² + 58ab - 21e) (-x+y)(5x + 6y) = -5x² - 6xy + 5xy + 6y² = -xy - 5x² + 6y²f) (x + 5y)(7x - y) = 7x² -xy + 35xy - 5y² = 7x² + 34xy - 5y²g) (2x - y)(x + y) = 2x² + 2xy - xy - y² = xy + x²
a) (x+1) (x+2) = x² + 2x + 1x + 2 = x² + 2 + 3xb) (3a+4)(a-5) = 3a² + 15a + 4a - 20 = 3a² + 19a - 20c) (2t + 1)(1 - 3t) = 2t - 6t + 1 - 3t = 6t² - 6 + 1d) (3ab - 7)(3 - 7ab) = 9ab + 21a²b² - 21 + 49ab = -21a²b² + 58ab - 21e) (-x+y)(5x + 6y) = -5x² - 6xy + 5xy + 6y² = -xy - 5x² + 6y²f) (x + 5y)(7x - y) = 7x² -xy + 35xy - 5y² = 7x² + 34xy - 5y²g) (2x - y)(x + y) = 2x² + 2xy - xy - y² = xy + x²h) (ab - a)(2ab + 6a) = 2a²b²v+ 6a²b - 2a²b - 6a² = 4a²b + 2a²b² - 6a
