The discriminant of the quadratic equation $-x^{2}-5x+6=0$ is :

Question

Accepted Answer

Step 1: Compare with $ax^{2}+bx+c=0$: here $a=-1,\; b=-5,\; c=6$.
Step 2: $D=b^{2}-4ac$.
Step 3: Substitute carefully, watching the signs.
$$D=(-5)^{2}-4(-1)(6)=25+24$$
Step 4: $D=49$.
Correct option is (C) 49.

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