Question

which of the following is quadratic equation (a) 3x^2+1=0 (b) x^3+1=0 (c) x^2+x+1=0 (d) both a and c
please give me the answer quickly​

Answer 1

Answer:

Correct option is

B

1

Quadratic equations 3x2+ax+1=0 and 2x2+bx+1=0 have a common root.

Let α be the common root.

⇒3α2+aα+1=0…(1)

 and 2α2+bα+1=0…(2)

Multiplying (1) by 2 and (2) by 3. 

Further solving those two equations for α gives 

α=b−a…(3)

Substituting (3) in(1)

⇒2(b−a)2+b(b−a)+1=0

⇒3b2+2a2−5ab+1=0

∴5ab−3b2−2a2=1

please mark it as brainliest

Answer 2

Answer:

d) both a and c

Step-by-step explanation:

both of these have x raise to power of 2