If k1,k2 are the sum and product of the slopes of the pair of lines 2x2+4xy+y2=0 then k1+k2 is

If  m1,m2are slopes of lines represented by the combined equation  ax2+2hxy+by2=0 then m1+m2=−2hb and  m1⋅m2=abGiven k1,k2are the sum and product of the slopes of the pair of lines 2x2+4xy+y2=0Hence, k1=−4 and k2=2Therefore, k1+k2=−2