Question

Resolver as equaçoes tipo Ax²+bx=0


A) 2x² = 7x        (R: 0 e 7/2)


B) 2x² = 8x         (R: 0 e 4)

Answer 1

a) 2x² = 7x
2x² - 7x = 0

delta= (-7)² - 4.2.0
delta= 49 - 0
delta= 49

x= 7 ± √49/2.2

x= 7 ± 7/4

x= 7 - 7/4= 0/4= 0

x= 7 + 7/4= 14/4= 7/2

s= { 0,7/2 }


b) 2x² = 8x
2x² - 8x = 0

delta= (-8)² - 4.2.0
delta= 64

x= 8 ± √64/2.2

x= 8 ± 8/4

x= 8 - 8/4=0/4= 0

x= 8 + 8/4= 16/4= 4

s={ 0,4 }

Espero ter ajudado!