Question

2- Resolva as seguintes equações de 2.° grau, sendo U = IR:

a) x² - 9 = 0

b) x² - 25 = 0

c) 3x² - 12 = 0

d) 5x² + 20 = 0

e) 3x² - 3 = 0

Answer 1

a)x²=9

√9=3 x1=3 x2=-3

b)x²=25

√25=5 x1=5 x2=-5

c)3x²-12=0

x²=12/3

x²=4

√4=2 x1=2 x2=-2

d)5x²+20=0

x²=-20/5

=√-5

e)3x²-3=0

x²=3/3

√1=1 x1=1 x2=-1