Question

Write an equation for the quadratic graphed below:

x-intercepts: (-3,0) and (1,0); y-intercept: (0,1)

Answer 1

y = k(x+3)(x-1) = k ( x*2 + 2 x -3)

if x = 0, y = 1 so 1 = -3 k
k = -1/3
y = -1/3 [ x^2 + 2 x - 3]