Question

The set of values of k, so that the quadratic equation x2 + kx + 1=0 has real roots, is

1 Mark[s]

k  ,<2.

k  >-2.

k  2 or k  -2.

k  2 or k  -2.​

Answer 1

Answer:

k = 2

Step-by-step explanation:

for a perfect quadratic equation the general formula is (x+a)² = x²+2ax+a² similarly, (x-a)² = x²-2ax+a²

if we put a=1 in (x+a)², (x+1)² = x²+2x+1

Answer 2

Answer:

Plant cuticle is the outermost layer of plants, which covers leaves, fruits, flowers, and non-woody stems of higher plants. It protects plants against drought, extreme temperatures, UV radiation, chemical attack, mechanical injuries, and pathogen/pest infection.