determine o conjunto de soluções das expressões do primeiro grau
a)4×+2=38
b)9×=6×+12
c)5×-1=3×+11
d)2×+8=×+13
e)2 ×-5=×-7
4 3 2
f)4×+2 - 5×- 7=3-×
3 6 2
g)20×-4=5×
a)4×+2=38
b)9×=6×+12
c)5×-1=3×+11
d)2×+8=×+13
e)2 ×-5=×-7
4 3 2
f)4×+2 - 5×- 7=3-×
3 6 2
g)20×-4=5×
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Resposta:
A) 4x + 2 = 38
4x − 36 = 0
( 4 ) ⋅ x + (− 36 ) = 0
x = − (− 36 )/4
x= − ( 4 ) ⋅ (− 9 )/( 4 )
= 9
B) 9x = 6x + 12
3x − 12 = 0
( 3 ) ⋅ x + (−12 ) = 0
x = − (−12 )/3
x = − ( 3 ) ⋅ ( −4 )/( 3 )
=4
C) 5x − 1 = 3x + 11
2x − 12 = 0
( 2 ) ⋅ x + ( −12 ) = 0
x = − ( − 12 )/2
x = − ( 2 ) ⋅ ( −6 )/( 2 )
= 6
D) 2x + 8 = x + 13
x − 5 = 0
( 1 ) ⋅ x + ( −5 ) = 0
x = − ( − 5)/1
x = 5
E) CONFIRMA PRA MIM SE É ASSIM 2x − 5 = x − 7432?
F) CONFIRMA PRA MIM SE É ASSIM 4 ⋅ 2 − 5 ⋅ − 7 = 3 − ⋅ 362 ?
G) 20x − 4 = 5x
15x − 4 = 0
( 15 ) ⋅ x + ( − 4 ) = 0
x = − ( − 4 )/15
x = 4/15
Explicação passo a passo:
ESPERO TER AJUDADO!