Answers

2016-03-16T19:10:26+05:30
A=1,B=a,C=-4
D=B^2- 4AC
D=(a)^2-4(1)(-4)
D=a^2+16
since square of no. or variable cannot be negative hence D>0
0
D>0
Oh yeah... Sorry
it's ok
...
plz mark it as brainliest ans