What is the value of the discriminant for the quadratic equation 0 = x + 2 + x2?

discriminant = b2 – 4ac

–9
–7
7
9

Option (b) is correct.

The discriminant for the given quadratic equation   is -7.

Step-by-step explanation:

Given quadratic equation

We have to find the discriminant for the given quadratic equation  .

Consider the quadratic equation .

The general form form of quadratic equation is , where a , b, c are the constants.

Discriminant for the general equation given by

Thus, for the given equation a= 1 , b = 1 , c = 2

Substitute , we get,

Solving we get,

Thus, the discriminant for the given quadratic equation   is -7.

Option (b) is correct.

50 min

step-by-step explanation:

they will be decreasing both their times in half

60 / 2 = 30

40/2 = 20

30 + 20 = 50