Question

What is the sum of the roots of the equation 2 x^2 + 5 x − 3 = 0?

a)-3.5
b)-2.5
C)-1.5
D)2.5

Answer 1

B) -2.5

Explanation:

2x^2 + 5x -3 = 0

(2x - 1)(x + 3) = 0

2x - 1 = 0; 2x = 1, so x = 1/2 = ROOT 1

x + 3 = 0, so x = -3 = ROOT 2

Now add the roots: -3 + 1/2 = - 2 1/2, so the answer is B.