From Förberedande kurs i matematik 1
Övning 2.3:1
Kvadratkomplettera följande uttryck
a)
| x2−2x
| b)
| x2+2x−1
| c)
| 5+2x−x2
| d)
| x2+5x+3
|
Svar 2.3:1
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Övning 2.3:2
Lös följande andragradsekvationer med kvadratkomplettering
a)
| x2−4x+3=0
| b)
| y2+2y−15=0
| c)
| y2+3y+4=0
|
d)
| 4x2−28x+13=0
| e)
| 5x2+2x−3=0
| f)
| 3x2−10x+8=0
|
Svar 2.3:2
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Övning 2.3:3
Lös följande ekvationer direkt
a)
| x(x+3)=0
| b)
| (x−3)(x+5)=0
|
c)
| 5(3x−2)(x+8)=0
| d)
| x(x+3)−x(2x−9)=0
|
e)
| (x+3)(x−1)−(x+3)(2x−9)=0
| f)
| x(x2−2x)+x(2−x)=0
|
Svar 2.3:3
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Övning 2.3:4
Bestäm en andragradsekvation som har rötterna
a)
| \displaystyle -1\ och \displaystyle \ 2
|
b)
| \displaystyle 1+\sqrt{3}\ och \displaystyle \ 1-\sqrt{3}
|
c)
| \displaystyle 3\ och \displaystyle \ \sqrt{3}
|
Svar 2.3:4
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Övning 2.3:5
a)
| Bestäm en andragradsekvation som bara har \displaystyle \,-7\, som rot.
|
b)
| Bestäm ett värde på \displaystyle \,x\, som gör att uttrycket \displaystyle \,4x^2-28x+48\, är negativt.
|
c)
| Ekvationen \displaystyle \,x^2+4x+b=0\, har en rot \displaystyle \,x=1\,. Bestäm värdet på konstanten \displaystyle \,b\,.
|
Svar 2.3:5
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Övning 2.3:6
Bestäm det minsta värde som följande polynom antar
a)
| \displaystyle x^2-2x+1
| b)
| \displaystyle x^2-4x+2
| c)
| \displaystyle x^2-5x+7
|
Svar 2.3:6
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