Question

Resolva as equações em seu caderno:
A) X²+7x=0
B) m²-5m=0
C) 3y²-18y=0
D) 2x²-9x=0
E) X²=0
E) 4x²=-3x

Answer 1

A)X² + 7 X = 0
X(X + 7 ) = 0
X = 0
X + 7 = 0
X = - 7
S = {0 ; -7 }
B)m² - 5 m = 0
m(m - 5 ) = 0
m = 0
m - 5 = 0
m = 5

C)3 y² - 18 y = 0
3 y (y - 6 ) = 
3 y = 0
y = 0/3
y = 0
y - 6 = 0
y = 6
S{0 ; 6}
d)2 x² - 9 x = 0
x(2 x - 9 ) = 0
x = 0
2 x - 9 = 0
2 x = 9
x = 9/2
S = {0 ; 9/2 }
E)X² = 0
X = √ 0 
X = 0
F)4 x² = - 3 x
4 x² + 3 x = 0
x(4 x + 3 ) = 0
x = 0
4 x + 3 = 0
4 x = -3
x = -3/4
S = {0 ; -3/4 }