Question

Select all of the following that are quadratic functions. x = 3y2 – 6y + 5, y + 3 = –2 x 2+ 5 , y = 2 x 2 – 8 x + 6, y= –7 x – 4, y – 3 x = 4 x 3 – x2 + 9, y = 5 x(x + 9) – 8, y – 2 x 2 = 3 x – 2 x 2 + 4

Answer 1

The standard form is ax² + bx + c = 0 with a, b, and c being constants, or numerical coefficients, and x is an unknown variable and if the highest power in the quation is 2 then it is a quadratic equation.

$x = 3y^{2}-6y + 5$ ----> Quadratic Equation

y +3 = -2x² +5----> Quadratic Equation

$y = 2 x^{2} - 8x + 6$ ----> Quadratic Equation

$y = -7x - 4$ ----> Non Quadratic Equation

$y - 3 x = 4 x^{3} - x^{2} + 9$ ----> Non Quadratic Equation

y = 5 x(x + 9) - 8----> Quadratic Equation

$y - 2x^{2} = 3 x - 2 x^{2} + 4$ ----> Quadratic Equation

Answer 2

Answer:

2. y + 3 = -2x^2 + 5

3. y = 2x^2 - 8x + 6

6. y = 5x (x+9) - 8