Question

Resolva as equações em R
a) x²-5x=0
b)-2x²-10x=0
c)3x²/4-5x=0
d)6x²=5x
e)(x+2)²=4

Answer 1

a
x² - 5x = 0
x ( x - 5 ) = 0
x = 0 ***
x - 5 = 0
x = 5 ****
b
- 2x² - 10x = 0
x² + 5x = 0
x ( x + 5) = 0
x = 0 ***
x + 5 = 0
x = -5 ***
c
???

d
6x² = 5x
6x² - 5x = 0
x ( 6x - 5 ) = 0
x = 0 ***
6x - 5 = 0
6x = 5
x = 5/6 ***
e
( x + 2)² = 4
( x² + 2 . x . 2  + 2²  = 4
x² + 4x + 4 - 4 = 0
x² + 4x = 0
x ( x + 4) = 0
x = 0 ***
x + 4= 0
x = -4 ****