Question

Which of the following equations represents a quadratic function? a) y = 2x + 3 b) y = 5x^2 - 2x + 1 c) y = 3√x + 4 d) y = 4x + 7

Answer 1

The following equation that represents a quadratic function is:
b) 5x^2 - 2x + 1
Since one of our variables, x is being raised to the power of 2 which is a characteristic of quadratic functions.
Most quadratic functions are written generally in the form of:
y = ax^2 + bx + c
where a cannot equal 0.