Question

Which of the following is a quadratic function?

a. y = x2 – 81

b. y = x4 – 64

c. y = x – 9

d. y = x3 – 27

Answer 1

a

Answer 2

a quadratic function has the x with power of 2 and the coefficient =/= 0
ax²=...a shouldn't be 0
ax² + bx = ... can also be written as x(ax + b)
ax² + bx +c =...
all three re thequadratic function