Respostas

2013-08-01T16:30:59-03:00
1)

a) x²-8x+15=0
8+|- raiz 64-60/2
8+|- raiz 4/2
8+|- 2/2
x=10/2 = 5
x=6/2 = 3

b)x²-9x+14=0
9+|- raiz 81-56/2
9+|- raiz 25/2
9+|-5/2
x=14/2 = 7
x=4/2 =2

c)x²+6x+8=0
-6+|- raiz 36-32/2
-6+|- raiz 4/2
-6+|- 2/2
x=-8/2 = -4
x=-4/2 = -2

d)x²+12x+11=0
-12+|- raiz 144-44/2
-12+|- raiz 100/2
-12+|- 10/2
x=-22/2 = -11
x=-2/2 = -1

e)x²-5x+6=0
5+|- raiz 25-24/2
5+|- raiz 1/2
5+|- 1/2
x=6/2 = 3
x=4/2 = 2

f)x²+5x-6=0
-5+|- raiz 25+24/2
-5+|- raiz 49/2
-5+|- 7/2
x=-12/2 = -6
x=2/2 =1

g)x²-x-12=0
1+|- raiz 1+48/2
1+|- raiz 49/2
1+|-7/2
x=8/2 = 4
x=6/2 = 3

h)x²-14x-32=0
14+|- raiz 196+128/2
14+|- raiz 324/2
14+|- 18/2
x=32/2 = 16
x=-4/2 = -2

i)x²-12x+36=0
12+|- raiz 144-144/2
12+|- 0/2
x=12/2 = 6

j)x²+4x+4=0
-4+|- raiz 16-16/2
-4+|- 0/2
x=-4/2 =-2

2-
a)x²-13x+12=0
13+|- raiz 169-48/2
13+|- raiz 121/2
13+|- 11/2
x=24/2 =12
x=2/2 = 1

b)x²+10x+21=0
-10+|- raiz 100-84/2
-10+|- raiz 16/2
-10+|- 4/2
x=-14/2 =-7
x=-6/2 =3
1 5 1
é só resolver cada uma das equações