2.3 Exercises

From Förberedande kurs i matematik 1

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|width="50%" | <math>x(x+3)=0</math>
|width="50%" | <math>x(x+3)=0</math>
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|b)
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|width="50%" | <math>(x-3)(x+5)=0</math>
|width="50%" | <math>(x-3)(x+5)=0</math>
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|c)
|c)
|width="50%" | <math>5(3x-2)(x+8)=0</math>
|width="50%" | <math>5(3x-2)(x+8)=0</math>

Revision as of 09:08, 1 April 2008

 

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Övning 2.3:1

Kvadratkomplettera följande uttryck

a) \displaystyle x^2-2x b) \displaystyle x^2+2x-1 c) \displaystyle 5+2x-x^2 d) \displaystyle x^2+5x+3

Övning 2.3:2

Lös följande andragradsekvationer med kvadratkomplettering

a) \displaystyle x^2-4x+3=0 b) \displaystyle y^2+2y-15=0 c) \displaystyle y^2+3y+4=0
d) \displaystyle 4x^2-28x+13=0 e) \displaystyle 5x^2+2x-3=0 f) \displaystyle 3x^2-10x+8=0

Övning 2.3:3

Lös följande ekvationer direkt

a) \displaystyle x(x+3)=0 b) \displaystyle (x-3)(x+5)=0
c) \displaystyle 5(3x-2)(x+8)=0 d) \displaystyle x(x+3)-x(2x-9)=0
e) \displaystyle (x+3)(x-1)-(x+3)(2x-9)=0 f) \displaystyle x(x^2-2x)+x(2-x)=0