21.  The quadratic equation whose roots are -1/2 and 2/3 is?
a(x+1/2)(x-2/3)=ax2-ax/6-a/3
Answer: ax2-ax/6-a/3=0 , a "\\mathrlap{\\,\/}{=}" 0. For example: if a=1, then x2-x/6-1/3=0
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