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Solucionario_libro_santillana_mataplic_ccss_bch1

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276<br />

Límite de una función<br />

059<br />

060<br />

Calcula los límites laterales y el siguiente límite.<br />

2 x − x −6<br />

0<br />

lim<br />

→<br />

x →3<br />

2 x − 6x + 9 0<br />

2 x − x −6<br />

x 3 x 2<br />

lim lim<br />

x→32 x x<br />

x→32<br />

− 6 + 9<br />

x 3<br />

=<br />

( − )( + ) x + 2 5<br />

= lim →<br />

( − )<br />

x →3<br />

x − 3 0<br />

lim<br />

− x →3<br />

lim<br />

+ x →3<br />

Resuelve los límites.<br />

a)<br />

( 2x− 3)( x + 3)<br />

lim<br />

x →−3<br />

( x + 1)( x + 3)<br />

d) lim<br />

x →5<br />

3 2 x − 9x + 15x + 25<br />

3 2 x − 5x + 2x−10 b) lim<br />

x →2<br />

2 2x − 9x + 10<br />

2 3x − 7x + 2<br />

e) lim<br />

x →2<br />

2 2x − 11x + 14<br />

2 4x − 16x + 16<br />

c)<br />

3 2<br />

3x + 12x − x−4<br />

lim<br />

x →−4<br />

3 2 x + 7x + 14x + 8<br />

f )<br />

3 2 x + x − x−1<br />

lim<br />

x →−1 3 2<br />

x + 2x<br />

+ x<br />

a)<br />

2 2x − 9x + 10 0<br />

b) lim<br />

→<br />

x →2<br />

2 3x − 7x + 2 0<br />

c)<br />

2 x − x −6<br />

2 x − 6x + 9<br />

2 x x 6<br />

2 x 6x 9<br />

=+<br />

⎫⎪<br />

⎪<br />

⎬<br />

⎪<br />

− − ⎪<br />

=+ ⎪<br />

⎪<br />

− + ⎭<br />

⎪<br />

( 2x − 3)( x + 3)<br />

0<br />

lim<br />

→<br />

( x + 1)( x + 3)<br />

0<br />

x →−3<br />

lim<br />

x →3<br />

→ lim<br />

x →3<br />

( 2x − 3)( x + 3)<br />

2x−3 lim = lim<br />

→− ( x + 1)( x + 3)<br />

→−<br />

x + 1<br />

x 3 x 3<br />

2 2x − 9x + 10 x 2 2x 5<br />

lim lim<br />

x→22 3x − 7x + 2 x→2x<br />

=<br />

( − )( − )<br />

( − − =<br />

−<br />

− =−<br />

2x5 1<br />

lim<br />

2)( 3x 1)<br />

x →2<br />

3x1 5<br />

3 2<br />

3x + 12x − x −4<br />

0<br />

lim<br />

→<br />

x →−4<br />

3 2 x + 7x + 14x + 8 0<br />

3 2 3x + 12x − x −4<br />

lim<br />

x→−4 3 2 x + 7x + 14x + 8<br />

x 4<br />

lim<br />

x→−4<br />

=<br />

2<br />

( + )( 3x−1) 2 ( x + 4)( x + 3x + 2)<br />

2 3x1 x 4 2 x 3x<br />

=<br />

−<br />

= lim =<br />

→− + + 2<br />

47<br />

6<br />

3 2 x − 9x + 15x + 25 0<br />

d) lim<br />

→<br />

x →5<br />

3 2 x − 5x + 2x −10<br />

0<br />

2 x − x−6<br />

2 x − 6x + 9<br />

− −<br />

− + =+<br />

2 x x 6<br />

<br />

2 x 6x 9<br />

= 9<br />

2<br />

3 2<br />

2<br />

2<br />

x − 9x + 15x + 25 ( x − 5)(<br />

x −4x −5)<br />

x −4x −5<br />

lim = lim<br />

= lim = 0<br />

x→53 2 x − 5x + 2x −10<br />

x→52<br />

( x )( x )<br />

x 5 2<br />

− 5 + 2<br />

→ x + 2

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