Question

me ajudem pfv socorro ​

Answer 1

Resposta:

a-) (a-7).(a-9) = a² - 9a - 7a + 63 = a² - 16a + 63

b-) (6 - 5x)(1 - 2x) = 6 - 12x -5x + 10x² = 6 -17x + 10x²

c-) (-x + 5) (x + 2) = -x² - 2x + 5x + 10 = -x² +3x + 10

d-) (x² + x - 1)(x - 1) = x³ - x² + x² - x - x + 1 = x³ - 2x + 1