Question

Resolva as equações no tipo C = 0

Answer 1

a
x² - 14x = 0
x ( x - 14 ) = 0
x = 0
x - 14 = 0
x = 14 ****
b
3x² + 5x = 0
x (3x + 5 ) = 0
x = 0
3x + 5 = 0
3x = -5
x = -5/3 ****
c
x²/5 + 8x/1 = 0
mmc = 5
x² + 40x = 0
x ( x + 40) = 0
x = 0 
x + 40 = 0
x = -40 ***
d
-7x² + 21x = 0 
7x² - 21x = 0
x² - 3x = 0
x ( x - 3 ) = 0
x = 0 
x - 3 = 0
x = 3 ***
e
5x = 30x²
x = 6x²
x - 6x² = 0
6x² - x = 0
x ( 6x - 1 ) = 0
x = 0
6x - 1 = 0
6x = 1
x = 1/6 ****
f
x + x² = -2x
x² + x + 2x = 0
x² + 3x = 0
x ( x + 3) = 0
x = 0
x + 3 = 0
x = -3 ***