Question

Resolver Equaçao do tipo Ax²+bx=0


a) x² - 7x = 0 (R: 0 e 7)

b) x² + 5x = 0 (R: 0 e -5)

c) 4x² - 9x = 0 (R: 0 e 9/4)

Answer 1

a)x^2=7x  
x^2/x=7    
x.x/x=7     
x=7
b)x^2=-5x   
   x^2/x=-5  
   x.x/x=-5   
   x=-5
c)4x^2=9x    
    x^2=9x/4   
    x^2/x=9/4
    x.x/x=9/4
    x=9/4