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BrendaXavier3
@BrendaXavier3
December 2019
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Sendo A= 2x²+5x-1, determine o valor de A para 1)X=-2 e 2)X=1
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matematica2018
Letra a
para x = -2
A = x² + 5x -1
= (-2)² + 5×(-2) -1
= 4 - 10 -1
= - 7
letra b
para x =1/2
A = x² + 5x -1
= (1/2)² + 5×(1/2) -1
= 1/4 + 5/2 -1
= ( 1 + 10 -4) /4
= 7/4
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Lista de comentários
para x = -2
A = x² + 5x -1
= (-2)² + 5×(-2) -1
= 4 - 10 -1
= - 7
letra b
para x =1/2
A = x² + 5x -1
= (1/2)² + 5×(1/2) -1
= 1/4 + 5/2 -1
= ( 1 + 10 -4) /4
= 7/4