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LuaGomes111
@LuaGomes111
June 2019
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Sendo f(x)=x²+3x, determine: a)f(0);
b)os valores de x para que se tenha y=0;
c)f(2);
d)os valores de x para que se tenha y=10;
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Marcelo6121
F( x ) = x2 + 3x
a) f( 0 ) = ( 0 ) 2 + 3• 0
f( 0 ) = 0 + 0
f( 0 ) = 0
b) y =0
x2 + 3x = 0
x( x + 3 ) = 0
x = 0
ou
x + 3 = 0
x = - 3
c) f( x ) = x2 + 3x
f( 2 ) = ( 2 ) 2 + 3• 2
f( 2 ) = 4 + 6
f( 2 ) = 10
d) y = 10
x2 + 3x = 10
x2 + 3x - 10 = 0
∆ = ( 3 ) 2 - 4• 1 • ( - 10 )
∆ = 9 + 40
∆ = 49
x' = ( - 3 + 7 ) / 2
x' = 4 / 2
x' = 2
x"= ( -3 - 7 ) / 2
x"= - 10 / 2
x"" = - 5
1 votes
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Lista de comentários
a) f( 0 ) = ( 0 ) 2 + 3• 0
f( 0 ) = 0 + 0
f( 0 ) = 0
b) y =0
x2 + 3x = 0
x( x + 3 ) = 0
x = 0
ou
x + 3 = 0
x = - 3
c) f( x ) = x2 + 3x
f( 2 ) = ( 2 ) 2 + 3• 2
f( 2 ) = 4 + 6
f( 2 ) = 10
d) y = 10
x2 + 3x = 10
x2 + 3x - 10 = 0
∆ = ( 3 ) 2 - 4• 1 • ( - 10 )
∆ = 9 + 40
∆ = 49
x' = ( - 3 + 7 ) / 2
x' = 4 / 2
x' = 2
x"= ( -3 - 7 ) / 2
x"= - 10 / 2
x"" = - 5