Question

calcule a equação x²+5X/9-4/9=0

Answer 1

x^2+5x/9-4/9=0 multiplicar tudo por 9
9x^2+5x-4=0
D=delta
D=b^2-4ac
D=5^2-4.9.(-4)
D=25+144=169
x=(-5+/-V169)/2.9
x=(-5+/- 13)/18
x'=(-5+13)/18=8/18=4/9
x"=-5-13/18=-18/18=-1
S={(4/9; -1)}
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