Grade 11 Math
posted by priya on .
i need help doing this question...
a quadratic funtion has these characteristics
axis of symmetry: -1
x=3 is the x- int
y= 32 is the maximum value
determine the y int of this parabola.
your information of "axis of symmetry : -1 " is ambiguous.
the axis of symmetry is a line, so it should be stated as an equation x = -1
I will assume that is what you meant.
vertex is (-1,32)
so the equation is
y = a(x+1)^2 + 32
but the x-intercept is 3, meaning the point (3,0) lies on it
0 = a(3+1)^2 + 32
a = -32/16 = -1/2
y = (-1/2)(x+1)^2 + 32