Question

resolva as equaçoes onde o coeficiente c = 0 alguem sabe ?
a) 4x2- 9x = o
b) x2+x=0
c) 5x2+x=0
d) 7x2 +14x=0
e) x2-7x =0

Answer 1

se c = 0, então:

a) 4x² - 9x = 0
x (4x - 9) = 0
x = 0
4x - 9 = 0
4x = 9
x = 9/4

b) x² + x = 0
x(x +1) = 0
x = 0
x+1 = 0 / x = - 1

c)5x² + x = 0
x(5x + 1) = 0
x = 0
5x + 1 = 0
5x = -1
x = -1/5

d) 7x² + 14x = 0
x(7x + 14) = 0
x=0
7x +14 = 0
7x = -14
x = -2

e) x² - 7x = 0
x (x -7) = 0
x=0
x-7 = 0
x = 7