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CarlaCastro16
@CarlaCastro16
December 2019
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1- Calcule
2x ( elevado 2 )+2x=40
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Vassão1
4x + 2x =40
6x=40
40
__ = X
6
X=6.6
0 votes
Thanks 1
mariocezar
Olá boa tarde e feliz dia dos papais para todos ☺
2x^2+2x=40
2x^2+2x-40=0÷(2)
x^2+x-20=0
a=1,b=1,c= - 20
/\=b^2-4a.c
/\=1^2-4.1. (-20)
/\=81
x= -b+/- \/ delta/2.a
x'= -1+9/2=>4
x"=-1-9/2=>-5
s={4, -5}
1 votes
Thanks 0
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6x=40
40
__ = X
6
X=6.6
2x^2+2x=40
2x^2+2x-40=0÷(2)
x^2+x-20=0
a=1,b=1,c= - 20
/\=b^2-4a.c
/\=1^2-4.1. (-20)
/\=81
x= -b+/- \/ delta/2.a
x'= -1+9/2=>4
x"=-1-9/2=>-5
s={4, -5}