Question

Resolva:
a) x² - 16x = 0
b) 2x² - 8x = 0
c) x² + 75x = 0
d) x² + 7x = 0
e) 3x² -12x = 0

Answer 1

resposta

a)x² - 16x = 0

x (x-16)=0

x=0 ou

x-16=0

x-16+16= 0+16

x=16

(0, e16)

b) 2x² - 8x = 0

x (2x-8)=0

x=0 ou

2x-8=0

2x-8+8= 0+18

2x=18

x=18/2

x=9

(0, e 9)

c) x² + 75x = 0

x(x+75)=0

x=0

x+75=0

x= -75

(0, e -75)

d) x² + 7x = 0

x (x+7)=0

x=0 ou

x+7-7=0-7

x= -7

(0, e -7)

e) 3x² -12x = 0

x(3x-12)=0 ou

3x-12+12=0+12

3x=12

x=12/3

x=4

(0, e 4)