Question

Quadratic equation mcq . If answered correctly you will be marked brainliest

1-If alpha, beta are the roots of the quadratic equation x2+x+1=0, then 1/ alpha +1/ beta
(a) 0 (b) 1 (c) –1 (d) none of these

2- If p and q are the roots of the equation x –px+q=0, then
(a) p = 1, q = –2 (b) p = –2, q = 0 (c) b = 0, q = 1 (d) p = –2, q = 1

3-Which of the following is a solution of the quadratic equation 2x^2 + x – 6 = 0? (a)x=2 (b)x=–12 (c)x= 3/2 (d)x=–3

4-The value of k for which x=–2 is a root of the quadratic equation kx^2 +x–6=0
(a) –1 (b) –2 (c) 2 (d) – 3/2

Answer 1

Answer:

1. c

Step-by-step explanation:

in an quadratic equation alpha plus beta equlas -b/a

alpha plus beta equlas -1/1 equal -1

alpha×beta equal c/a

alpha × beta equal 1/1 equal 1

1/alpha plus 1/beta equlas (alpha + beta)/alpha ×beta

-1/1 equal -1

2.