Question

Resolva as equações incompletas:
a) 4ײ -9×= 0
b) 3ײ +5×= 0
c)4ײ - 12× = 0
d)ײ+× = 0

Answer 1

a) x ( 4x - 9 ) = 0

X1 = 0

4x - 9 = 0 ⇒ 4x = 9 ⇒ X2 = 9/4 ⇒ S = { 0, 9/4 }

b) x ( 3x + 5 ) = 0
X1 = 0

3x + 5 = 0 ⇒ 3x = -5 ⇒  X2 = -5/ 3 ⇒ S = { 0, -5/3 }

c) x ( 4x - 12 ) = 0
X1 = 0

4x - 12 = 0 ⇒ 4x = 12 ⇒ X2 = 12/ 4 ⇒ X2 = 3 ⇒ S = { 0, 3 }


d) x ( x + 1 ) = 0
X1 = 0

x + 1 = 0 ⇒ X2 = -1 ⇒ S = { 0 , -1 }