Getalpatrone (rekenkundige ry met alfabetletters)

Re: Getalpatrone

by Marna Zuhlsdorff -
Number of replies: 0
Hi Bennu

Baie dankie vir jou vraag en bewerking - jy was amper reg met jou bewerking in postlood.
Hierdie is 'n rekenkundige rye som met alfabetletters - click hier om die video daaroor weer te kyk.

By a) gebruik ons die definisie van 'n rekenkundige ry open parentheses d equals T subscript 2 minus T subscript 1 equals T subscript 3 minus T subscript 2 close parenthesesom vir x uit te werk.
table row cell Vervang space 2 x plus 6 semicolon space 5 x minus 1 semicolon space 10 x plus 4 space in space space space space space space space space space space space space space space space space space space space space space space T subscript 2 minus T subscript 1 space equals T subscript 3 minus T subscript 2 end cell row cell open parentheses 5 x minus 1 close parentheses minus open parentheses 2 x plus 6 close parentheses equals open parentheses 10 x plus 4 close parentheses minus open parentheses 5 x minus 1 close parentheses end cell row cell 5 x minus 1 minus 2 x minus 6 equals 10 x plus 4 minus 5 x plus 1 end cell row cell 3 x minus 7 equals 5 x plus 5 end cell row cell 3 x minus 5 x equals 5 plus 7 end cell row cell negative 2 x equals 12 end cell row cell x equals negative 6 end cell end table

b)
Nou is dit net 'n doodgewone 'straight forward' rekenkundige ry - click hier om 'n video daaroor te kyk.
E e r s space w e r k space o n s space d i e space r y space s e space r e g t e space g e t a l l e space u i t colon space v e r v a n g space x equals negative 6 space i n table attributes columnalign left end attributes row cell space space space space space 2 x plus 6 semicolon space space space space space space space space space 5 x minus 1 semicolon space space space space 10 x plus 4 end cell row cell 2 open parentheses negative 6 close parentheses plus 6 semicolon space space space 5 open parentheses negative 6 close parentheses minus 1 semicolon space space space space 10 open parentheses negative 6 close parentheses plus 4 end cell row cell space space space space space space space space space space space minus 6 semicolon space space space space space space space space space space space minus 31 semicolon space space space space space minus 56 end cell end table M e t space d i e space g e t a l l e space p a t r o o n space k a n space o n s space n o u space i n l i g t i n g s l y s i e space m a a k space e n space s o m space u i t w e r k colon table row cell I n l i g t i n g s l y s i e end cell blank blank blank cell B e w e r k i n g end cell row cell a equals negative 6 end cell blank blank blank cell T subscript n equals a plus d open parentheses n minus 1 close parentheses end cell row cell d equals T subscript 2 minus T subscript 1 end cell blank blank blank cell equals negative 6 plus open parentheses negative 25 close parentheses open parentheses n minus 1 close parentheses end cell row cell equals open parentheses negative 31 close parentheses minus open parentheses negative 6 close parentheses end cell blank blank blank cell equals negative 6 minus 25 n plus 25 end cell row cell equals negative 25 end cell blank blank blank cell equals negative 25 n plus 19 end cell row cell n equals 10 end cell blank blank blank blank row cell T subscript 10 equals ? end cell blank blank blank cell T subscript 10 equals negative 25 open parentheses 10 close parentheses plus 19 end cell row blank blank blank blank cell equals negative 231 end cell end table

c)
As jy reg afgeskryf het, is hierdie 'n sneaky som!
Onthou n (die posisies van die terme) moet altyd 'n POSITIEWE HEELGETAL wees, so dit kan nie 'n negatiewe getal wees nie en dit kan ook nie 'n desimale getal wees nie.
As
table row cell a equals negative 6 end cell blank blank blank cell T subscript n equals negative 25 n plus 19 end cell row cell d equals negative 25 end cell blank blank blank cell Stel space T subscript n equals 202 end cell row cell T subscript n equals 202 end cell blank blank blank cell 202 equals negative 25 n plus 19 end cell row cell n equals ? end cell blank blank blank cell 183 equals negative 25 n end cell row blank blank blank blank cell n equals negative 7.32 end cell row blank blank blank blank cell therefore geen space oplossing end cell end table D a a r space i s space g e e n space t e r m space i n space h i e r d i e space r y space w a t space apostrophe n space w a a r d e space v a n space 202 space h e t space n i e