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Jika dan  akar akar persamaan kuadrat  dan maka

Jika begin mathsize 14px style italic a end style dan begin mathsize 14px style b end style akar akar persamaan kuadrat begin mathsize 14px style x ² minus left parenthesis a plus 3 right parenthesis x plus c end style dan begin mathsize 14px style b ² equals space a plus 10 end style maka begin mathsize 14px style c ² plus c space equals... end style

  1. ....

  2. ....

Jawaban:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell a plus b end cell equals cell a plus 3 end cell row blank rightwards arrow cell b equals 3 end cell row cell 3 squared end cell equals cell a plus 10 end cell row blank rightwards arrow cell a equals negative 1 end cell row cell a times b end cell equals c row blank rightwards arrow cell c equals negative 1 times 3 equals negative 3 end cell end table end style 

Sehingga diperoleh :

begin mathsize 14px style c squared plus c equals left parenthesis negative 3 right parenthesis squared plus left parenthesis negative 3 right parenthesis equals 6. end style 

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