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LuanaS25
@LuanaS25
December 2019
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Marque a alternativa correta sobre a equação (x - 9)(x + 2) = 2x - 9:
a) admite duas raízes reais e iguais.
b) admite duas raízes reais e opostas.
c) admite apenas uma raiz
d) não admite raízes reais
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mayarasantosfc
(x-9)(x+2)=2x-9
x²+2x-9x-18=2x-9
x²-7x-18-2x+9=0
x²-9x-9=0
Δ=b²-4ac
Δ=9²-4.1.(-9)
Δ=81+36
Δ=117
1 votes
Thanks 0
LuanaS25
É (x -9) e não (x -3). De qualquer forma, obrigada pela ajuda!
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x²+2x-9x-18=2x-9
x²-7x-18-2x+9=0
x²-9x-9=0
Δ=b²-4ac
Δ=9²-4.1.(-9)
Δ=81+36
Δ=117