Question

which function is a quadratic function? a(x) = –2x3 2x – 6 b(x) = 5x3 8x2 3 c(x) = –8x2 3x – 5 d(x) = 6x4 2x – 3

Answer 1

Hello,

A quadric function has 2 as degree.

Answer C
c(x)=-8x²+3x-5

Answer 2

A function is called quadratic function if the highest degree of  polynomial having single variable is 2.  

For example : x², x²+x, x²+3, x²+x+3,

Or General form of Quadratic function = a x² + b x + c

The graph of quadratic function is in the shape of Parabola .It cuts the X axis in two points.

Either both the roots of Quadratic function is Real or both are Imaginary.

Among all the options : Option(3) which is c(x)= -8 x²...3 x -5 is Quadratic.

.......= either +ve sign or -ve sign.