Please help me with these Quadratic Equations questions, I have an exam tomorrow, and I want to pass with an A+! Thanks! :)

Question

markchernioglo · Answer

Which is a quadratic model for the given data?
x: 0.9   2.0   3.2   4.1
y: 2      8       18   32

A. y=2.2x^2-1.8x+2.1
B. y= 2.1x^2+2.2x-1.8
C. y= -1.8x^2+2.1x+2.2

princeharryyy · Answer

easy method-plug in the values of x and find y using equations.
hard method- take y = ax^2+bx+c as the gen equation. plug in values three times find a b c

3mar · Answer

and the easiest way,@markchernioglo is to do such that: https://www.desmos.com/calculator/qxtkdg0kw5

markchernioglo · Answer

Thank you both prince and 3mar! :)

3mar · Answer

Don't mention it!
Any Help... Any Time...

What matters is that you got the idea!