Answer:
A function is called Quadratic if ,it consist of only one variable, maximum of three terms, and highest degree of the variable in that Polynomial is 2.
Let start from option 1
A. y *(y+4) - y =6
y² + 4 y - y -6=0
y²+3 y -6=0
This is Quadratic Function.
Option B:
3 x +2 + 6 x -1=0
9 x-1=0
Not, Quadratic Function
Option C:
4 b*(b)=0
4 b²=0
This is Quadratic Function.
Option D:
3 a- 7 =2 * (7 a-3)
3 a - 7=14 a - 6
3 a - 14 a = 7 -6
-11 a =1
Not a Quadratic Function.
Option A : y(y + 4) - y = 6
And, Option C: 4 b (b)=0
are Quadratic Functions.
