Question

check whether 2x^2 +x-1 =0 has real roots or not​

Answer 1

Answer:

$2x^2 +x-1 =0$

Comparing it with $ax^2+bx+c=0$

$a=2, b=1, c=-1$

$D= b^2-4ac$

$D=(1)^2-4(2)(-1)$

$D=1+8$

$D=9$

$D>0$

$2x^2+x-1=0$ has real roots