Question

which of the following is a quadratic equation

a. (x+1)(x+3)=(x-1)(x-4)
b.(x+1)(x+2)=x+3
c.x+x+2x+3=0
d.x3-x=x2+2​

Answer 1

Answer:

c. x+x+2x+3=0

Step-by-step explanation:

since x+x+2x+3=0 becomes x^2+2x+3=0 and quadratic equation equals 0 and are in the form x^2+ax+b

Answer 2

Answer:

b

Step-by-step explanation:

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

$x^{2} +2x+x+2=x+3$

$x^{2} +2x+x-x+2-3=0$

$x^{2} +2x-1=0$