$\displaystyle \mbox{if}\ ax^2+2x+1=0,x^2+2x+a=0\ \mbox{these quadratic equations have common roots.find out the real value of a.} $
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Try using the quadratic equation for each one and then since they have common roots equate both equations. I can see by inspection that a=1. Hope this helps
I am also find that value but i can't find out the other value for a.
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