Subject: Quadratic Equation Hi my name is Lori. I'm a student, in the 11th grade.I have a problem in quadratic functions. I don't know how to get the numbers into the problem and then how to do the problem. here is one problem the rest are sort of similar to it... y=2x squared. If I were to find out how to get the (x,y) answers then I could graph it but as I said I can't find the numbers to go into the problem. Also in the equation g: x arrow to y = x + 4..... how would you know weather it is or isn't a quadratic equation???? Thanks Much, Lori Hi Lori,The expression y = 2 x^{2} describes the relationship between x and y. What is says is that if x is any number then y is twice the square of x. Thus if x is 3 then y is twice 3^{2}, that is y is 2*9 = 18 and if x is 1 then y is 2*(1)^{2} = 2. Hence to "find the numbers to go into the problem" you get to choose x and then see what y results. Here are some more examples.
In your second question y = x + 4 is not a quadratic equation since it doesn't have an x^{2} term. A quadratic equation is one with the form where a, b, and c are numbers with a not being zero. Thus y = 3 x^{2}  7, y = x^{2} + 5 x  5 anf y = 9 x^{2} + 5 x are quadratics but y = 3 x + 9 and are not. Cheers,Penny
