Question

Equaçoesescritas na forma reduzida usando a formula resolutiva,determine o conjento soluçao de cada equaçao no conjunto IR. a) x² -x-12=0 b)x² -3x-28=0

Answer 1

a) x^2-x-12=0
delta=b^2-4.a.c
delta=(-1)^2-4.1. (-12)
delta=1+48
delta=49
x=-b-/+ raiz de delta/2a
x=-(-1)-7/2.1
x=1-7/2
x=-6/2
x=-3
x=-(-1)+7/2.1
x=1+7/2
x=8/2
x=4
S={ X € R / x=-3 ou x=4}
b) x^2-3x-28=0
delta=b^2-4.a.c
delta= (-3)^2-4.1.(-28)
delta=9+112
delta=121
x=-b-/+ raiz de delta/2a
x=-(-3)-11/2.1
x=3-11/2
x=-8/2
x=-4
x=-(-3)+1/2.1
x=3+1/2
x=4/2
x=2
S={X € R/x=-4 ou x=2}

Answer 2

Resposta:

a) x^2-x-12=0

delta=b^2-4.a.c

delta=(-1)^2-4.1. (-12)

delta=1+48

delta=49

x=-b-/+ raiz de delta/2a

x=-(-1)-7/2.1

x=1-7/2

x=-6/2

x=-3

x=-(-1)+7/2.1

x=1+7/2

x=8/2

x=4

S={ X € R / x=-3 ou x=4}

b) x^2-3x-28=0

delta=b^2-4.a.c

delta= (-3)^2-4.1.(-28)

delta=9+112

delta=121

x=-b-/+ raiz de delta/2a

x=-(-3)-11/2.1

x=3-11/2

x=-8/2

x=-4

x=-(-3)+1/2.1

x=3+1/2

x=4/2

x=2

S={X € R/x=-4 ou x=2}

Explicação passo-a-passo: CONFIA