Question

which of the following is a quadratic equation ?

a : x²+2x+1=(4-x)²+3

b : -2x²=(5-x) (2x-2/5)

c : (k+1)x⅔+3/2x=7 , where k= -1 d

d : x³-x²=(x-1)³​

Answer 1

Answer:

option a. is a quadratic equation

Step-by-step explanation:

because the power is two