Question

X square + 10 bracket 2 x + k - 1 bracket close + 2 equal to zero find the has equal roots find k

Answer 1

x²+10(2x+k-1)+2=0
or x²+20x+10k-10+2
or x²+20x+10k-8
since it has equal roots
b²-4ac=0
or400=4*(10k-8)
or 10k-8=100
or k=108/10=10.8