Determine o valor de delta das equações do 2 grau
a) 5x+3x²=4x-7
b)x²+4x=2.(x-1)
c) x.(2x-3)=4x-1
d) 4x.(x+3)+9=0
a) 5x+3x²=4x-7
b)x²+4x=2.(x-1)
c) x.(2x-3)=4x-1
d) 4x.(x+3)+9=0
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=> 3X²+5X-4X+7=0
=>3X²+1X+7=0<=
↓DELTA↓
B²-4.A.C
(1)²-4.3.(7)
1-84
∆=> -83
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B) x²+4x=2.(x-1)
=> x²+4x=2x-2
=>x²+4x-2x+2
=>x²+2x+2=0<=
↓DELTA↓
(2)²-4.1.2
4-8=> -4
∆=-4
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C) X.(2X-3)=4X-1=>0
2X²+3X=4X-1=>0
2X²+1X+1=> 0
↓DELTA↓
(1)²-4.2.(1)
1-8
∆=> (-7)
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D)4x.(x+3)+9=0
4x²+12x+9=0
↓DELTA↓
(12)²-4.4.(9)
144-144
∆=> 0
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boa noite!! :)