Determine as raizes das equações incompletas do 2° grau:
1) X²-9x=0
2) X²-x=0
3) 7x²=0
4) x²+49=0
Valendo 30 pts
Soluções para a tarefa
Respondido por
1
x²-9x=0
∆=b²-4.a.c
-9²-4.1.0
81-0
81
b+/-√∆
----------
2.a
-9+/-√81
------------
2.1
-9+/-9
--------
2
x'= -9+9/2= 0
x"= -9+(-9)/2=9
∆=b²-4.a.c
-9²-4.1.0
81-0
81
b+/-√∆
----------
2.a
-9+/-√81
------------
2.1
-9+/-9
--------
2
x'= -9+9/2= 0
x"= -9+(-9)/2=9
Respondido por
2
1) x² - 9x = 0
x ( x - 9) = 0
x = 0
x - 9 = 0
x = 9
s={ 0, 9 }
2) x² - x = 0
x ( x - 1) = 0
x = 0
x - 1 = 0
x = 1
s={ 0, 1 }
3) 7x² = 0
x² = 0/7
x² = 0
x = ± √0
x = 0
4) x² + 49 = 0
x² = -49
x = √-49
x = ± √-49
x ( x - 9) = 0
x = 0
x - 9 = 0
x = 9
s={ 0, 9 }
2) x² - x = 0
x ( x - 1) = 0
x = 0
x - 1 = 0
x = 1
s={ 0, 1 }
3) 7x² = 0
x² = 0/7
x² = 0
x = ± √0
x = 0
4) x² + 49 = 0
x² = -49
x = √-49
x = ± √-49
Perguntas interessantes