1) determine o valor de ABC?
a)5x²-7x+8=0
b)6x²+9-3x=0
c)6x²-21=0
d)-4-2x³-6x=0
e)-x²+9x=0
a)5x²-7x+8=0
b)6x²+9-3x=0
c)6x²-21=0
d)-4-2x³-6x=0
e)-x²+9x=0
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Explicação passo-a-passo:
a) a= 5
b= -7
c= 8
b)a= 6
b= -3
c= 9
c) a= 6
b=0
c= -21
d) Se for: -2x² -6x -4=0
a= -2
b= -6
c= -4
e) a= -1
b= 9
c= 0