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Samenvatting Wiskunde B – MathPlus – 4 VWO – H7 Machtsfuncties $3.21   Add to cart

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Samenvatting Wiskunde B – MathPlus – 4 VWO – H7 Machtsfuncties

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Samenvatting: Wiskunde B – MathPlus – 4 VWO – H7 Machtsfuncties

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  • December 27, 2021
  • 4
  • 2020/2021
  • Summary
  • Secondary school
  • 4
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Joël Smit | 4V.wisb1


Wiskunde (B) – Hoofdstuk 7 Machtsfuncties
§7.1 Werken met machten
Machtsfunctie = Grondtal is variabele, exponent is getal
 Heeft vorm y = a*xp  Er geldt:
 y is recht evenredig met een macht van x
 a is evenredigheidsconstante
Bij y = xp (dus a = 1) geldt:
 x = p√y  Alleen als p > 1 en geheel getal
 p oneven getal  1 oplossing
 p even getal  2 oplossingen
 x = y1/p
Eigenschappen van machten en exponenten:
 x0 = 1
1
 x-a = a als x ≠ 0
x x = 5y4 Ribben van kubus 2x zo groot
1 a  Oppervlakte?
 x^ = √x als x ≥ 0 en a > 0 y4 = x/5
a
y4 = 1/5 x Kubus heeft 6 vlakken
 xa+b = xa * xb
 xa-b = xa / xb als x ≠ 0 y = (1/5 x)1/4 6*22 = 6*4 = 24
 (xa)b = xa*b y = (1/5)1/4 * x1/4 Oppervlakte was al 6*12 = 6
x1/4 recht evenredig met y = 4x zo groot
y = ax  x recht evenredig met y
y = axp  xp recht evenredig met y
y = ax2  Als x 2 keer zo groot wordt, wordt y 22 = 4 keer zo groot
Mantel van kegel uitrollen
Oppervlakte mantel van kegel:  Straal van uitgerolde
Omtrek uitgerolde cirkel = 2πr√2 cirkel = lengte van de rand
Omtrek grondvlak kegel = 2πr van de kegel tot de top
Oppervlakte uitgerolde cirkel = 2πr2
Verhouding opp mantel / opp cirkel = Verhouding omtrek
mantel / omtrek cirkel = 2πr / 2πr√2 = 1/√2
Oppervlakte mantel is dan 2πr2 * 1/√2  2πr2 / √2 = √2 πr2
Want: 4/√4 = 4/2 = 2 = √4  Dus 2/√2 = √2



§7.2 Kwadratische functies als machtsfuncties
Kwadratische functie = Functie in vorm f(x) = a(x – p)2 + q als a ≠ 0
Grafiek van kwadratische functie is parabool met:
 Top (p,q)
 Symmetrieas x = p
 a > 0  :)  Dalparabool
 a < 0  :(  Bergparabool



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