if a2+ 4b2= 17 and ab = 2 find a+ 2b Share with your friends Share 7 Priyanka Kedia answered this Dear Student, We have,a+2b2=a2+4b2+4ab =17+4×2 Given, a2+4b2=17 and ab=2 =17+8 =25⇒a+2b2=25⇒a+2b=±25⇒a+2b=±5 Hope this would have clear your doubt. Do let us know in case of any further concerns. -1 View Full Answer