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Raysophia
@Raysophia
December 2019
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. Seja a função f : IR IR, dada por f(x) = x2 – 5x + 7. Determine:
a) a imagem para x = 4;
b) o domínio para y = 1.
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marcia2017
F(4)=x²-5x+7
f(4)=4²-5.4+7
=16-20+7
=-4+7
a) =3
b)1=x²-5x+7
x²-5x+7-1=0
x²-5x+6=0
5 + ou - √25-4.1.6
----------------------------
2
5 + ou - √25-24
---------------------
2
5 + ou - √1
---------------
2
5( + ou -)1
--------------
2
x'=3
x"=2
1 votes
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Lista de comentários
f(4)=4²-5.4+7
=16-20+7
=-4+7
a) =3
b)1=x²-5x+7
x²-5x+7-1=0
x²-5x+6=0
5 + ou - √25-4.1.6
----------------------------
2
5 + ou - √25-24
---------------------
2
5 + ou - √1
---------------
2
5( + ou -)1
--------------
2
x'=3
x"=2