Question

determine as raízes das equaçoes:
a) x² - x - 20 = 0
b) x² - 3x - 4 = 0
c) x² -8x + 7 = 0

Answer 1

a) ( x + 4 )( x - 5 )
b) ( x + 3 )( x - 4 )
c) ( x - 7 )( x - 1 )