CBSE
2026
Class Class 10 · Mathematics
1 Marks · Mcq
✅ Verified
The discriminant of the quadratic equation $2x^{2}-3x-5=0$ is :
A. $-31$
B. $49$
C. $7$
D. $\sqrt{-31}$
✅ Answer & Solution
✅ Correct Answer: B
Step 1: Compare $2x^{2}-3x-5=0$ with $ax^{2}+bx+c=0$, so $a=2,\; b=-3,\; c=-5$.
Step 2: Discriminant $D=b^{2}-4ac$.
Step 3: Substitute the values.
$$D=(-3)^{2}-4(2)(-5)=9+40$$
Step 4: $D=49$.
Correct option is (B) 49.
✅ Verified by Super Admin
