1-Calcule as raízes das seguintes funçoes de 2 grau:
A) f(x) =x²-13x+30
B) f(x) =x²+11x+30
C) f(x) =2x²(2x ao quadrado)-8x+6
Soluções para a tarefa
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a-x²-13x+30
Δ= 13²-4. 1.30
Δ=169-120=49
x=13+-7/2=
x1=13+7/2= 10
x2=13-7/2= 3
b- x²+11x+30
Δ= 11²-4.1.30
Δ= 121-120=1
x= -11+-1/2=
x1= -11+1/2= -5
x2=-11-1/2= -6
c-2x²-8x+6
Δ=-8²-4.2.6
Δ=64-48= 16
x= 8+-4/4=
x1= 8+4/4=6
x2= 8-4/4=1
Δ= 13²-4. 1.30
Δ=169-120=49
x=13+-7/2=
x1=13+7/2= 10
x2=13-7/2= 3
b- x²+11x+30
Δ= 11²-4.1.30
Δ= 121-120=1
x= -11+-1/2=
x1= -11+1/2= -5
x2=-11-1/2= -6
c-2x²-8x+6
Δ=-8²-4.2.6
Δ=64-48= 16
x= 8+-4/4=
x1= 8+4/4=6
x2= 8-4/4=1
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