The quadratic function are:
option: A A) y(y + 4) - y = 6
Option: C C.) 4b(b) = 0
We know that the general equation of a quadratic equation in terms of a variable x is given by:
[tex]ax^2+bx+c=0[/tex]
A)
y(y + 4) - y = 6
On simplifying the terms we have:
[tex]y^2+4y-y=6\\\\y^2+3y-6=0[/tex]
Hence, option: A is correct.
B)
(3x + 2) + (6x - 1) = 0
[tex](3x + 2) + (6x - 1) = 0\\\\i.e.\\\\3x+2+6x-1=0\\\\i.e.\\\\3x+6x+2-1=0\\\\i.e.\\\\9x+1=0[/tex]
Hence, it is a linear equation.
Hence, option: B is incorrect.
C)
4b(b) = 0
it could also be written as:
[tex]4b^2=0[/tex]
Hence, it is a quadratic equation.
Hence, option: C is correct.
D)
3a - 7 = 2(7a - 3)
[tex]3a-7 = 2(7a-3)\\\\i.e.\\\\3a-7=14a-6\\\\\\i.e.\\\\14a-6-3a+7=0\\\\i.e.\\\\14a-3a-6+7=0\\\\i.e.\\\\11a+1=0[/tex]
which is again a linear equation.
Hence, option: D is incorrect.
