Tecnico

5- ) (x-1/3) (2x+1/5)=1
2x2+1/5x-2/3x-1/15=1
2x2-7/15x-1/15=1
2x2-7/15x-16/15-1=0
2x2-7/15x-16/15=0
30x2-7x-16=0
X= -b+- b2-4ac
2a
X=-(-7)+- (-7)2-4(30) (-16)60

X=7+- 49+1920
60

X=7+- 1969
60

X=7+44.3 = 51.3 = .855
60 60

X=7-44.3 = -37.3 = -.62
6060

6- )
W+1 = w-3
W-2 w+7

(W+1)(W+7)= (w-3) (w-2)
W2+7w+w+7=w2-2w-3w+6
8w+7=-5w+6
13w+1=0
W=-1
13

7- ) 3x2-2x + x =3
4 73x2-10 x -3=0
28
3x2-5 x -3=0 42x2-5x-42=0
14X=-b+- b2-4ac x=-(-5)+- (-5)2-4(42) (-42)2a 84

X=5/14+- (-5/14)2-4(3) (-3) x=5+- 25+70566 84

X=5/14+- 25/196+36 x1=5+84.1 = 1.056 84

X=.35+- 36.12x2=5-84.1 = -.94
6 84

X=.35+6.01 = 1.066

X2=.35-6.01 = -.943
6

8-) (X2-12/7 x=0)
7x2-12x=0
X (7x-12)=0
X=0
7x-12=0
7x=12
X=12/7

X=6
9- ) x3-70x+204=0
X3-70x+204=(x-6) (x2+6x-34)...