Question

Find a quadratic function that has a y-intercept of y=4 and is increasing on the point (3,28).

Answer 1

have you tried to solve this?

Answer 2

no i cant do it

Answer 3

i think its f(x)=x^2-4

Answer 4

no, if you let x=0 which is the y intercept then you get y=-4
let me assist

Answer 5

the quadratic has to be on the form y=ax^2+bx+c

when x=0 the y intercept is c so what do you think c should be?

Answer 6

i dont know

Answer 7

just substitute x=0 into the general quadratic equn and you will get a y value

Answer 8

and you already know that the y-intercept has to be 4 i.e. when x=0, y=4

Answer 9

so what should c equal?