Question

6)Resolva as equações considerando U=|R

A) x²+7x=0
B) m²-5m=0
C) 3y²-18y=0
D) 2x²-9x=0
E) x²=x
F) 4x²=-3x

Answer 1

x² + 7x = 0
x ( x + 7) = 0
x = 0
x + 7 = 0
x = -7 ****

b
m² - 5m = 0
m ( m - 5) = 0
m = 0
m - 5 = 0
m = 5 ***
c
3y² - 18 y = 0
y² - 6y = 0
y( y - 6 ) = 0
y = 0
y - 6 = 0
y = 6 ***
d
2x² - 9x = 0
x ( 2x - 9 ) = 0
x = 0
2x - 9 = 0
2x = 9
x = 9/2 ****

e
x² = x
x² - x = 0
x ( x - 1) = 0
x = 0
x - 1 = 0
x = 1 ***
f
4x² = - 3x
4x² + 3x = 0
x ( 4x + 3 ) = 0
x = 0
4x + 3 = 0
4x = -3
x = -3/4 ***