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QUINTA PRÁCTICA – MATLAB

1. a 6

1 − x2=

5

1 + x−

3

1 − x

>> syms x>> xsol=solve(6==2-8*x,x) xsol = -1/2

1. b ( x+2 )∗( x− 4 )7 ( x+3 )∗( x− 5 )−

( x+4 )∗( x− 7 )12 ( x+5 )∗( x− 8 )=

5

84

>> syms x>> xsol=solve(((x+2)*(x-4))/(7*(x+3)*(x-5))-((x+4)*(x-7))/(12*(x+5)*(x-8))==5/84,x) xsol = -25

2. ax2

+ 3 ∗ x+ 2.16 = 0

>> syms x>> xsol=solve(x^2+3*x+2.16==0,x) xsol = -6/5

-9/5

2. b x+ √ x2 + x+ 1

x− √ x2 + x+ 1+

x− √ x2 + x+ 1 x+ √ x2 + x+ 1

=− 11

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>> syms x>> xsol=solve(4*x^2-9*x-9==0,x) xsol =

3 -3/4

3. a 7 √5 16 + 5 x5 x+ 5 2 = 5

>> syms x>> xsol=solve(5^9==5^x,x) xsol = 9

3. bx x− √ x+1 = √ x+2

>> syms x>> xsol=solve(x^(x-(x+1)^0.5)==x^0.5+2,x) xsol = 3.1946144656910019847772576592229

4. a Ix − 5 I = I 3 x− 6 I

>> syms x>> xsol=solve(a s(x-5)==a s(3*x-6),x) xsol = 0.5

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4. b Ix− 3 I + I x2

− 1 I = 8

>> syms x>> xsol=solve(a s(x-3)+a s(x^2-1)==8,x)!a"#$#%& 'oss$ ly s "$o s sol $o#s. solvel$ && "y a e ys em!a"#$#%& 'oss$ ly s "$o s sol $o#s. solvel$ && "y a e ys em

xsol = -2.0

5. a 38 x+ 5 y= 550

56 x+60 y= 1200

>> syms x y>> x2,y2 =solve(38*x+5*y==550,56*x+60*y==1200) x2 = 27/2

y2 = 37/5

5. b x+ 1

3+

y− 12

= 0

x+ 2 y3

− x+ y+ 24

= 0

>> syms x y>> x2,y2 =solve((x+1)/3+(y-1)/2==0,(x+2*y)/3-(x+y+2)/4==0) x2 = -13/7

y2 =

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