Passes through (2,28) ; X-intercepts of -2 and 1

Answer 1

passes through (2,28) (-2,0) and (1,0)

can't be linear. you probably want a quadratic, a parabola

y = a(x-1)(x+2)

28 = a(1)(4)

a = 7

y = 7(x-1)(x+2)

y = 7(x^2+x -1)

y= 7x^2 +7x -7

or write in vertex form if you prefer

y =a(x-h)^2 +k

y =7(x^2+x +1/4) -7-7/4

y = 7(x+1/2)^2 - 9.25 where vertex is (-.5, -9.25)

for an upward opening parabola, x intercepts -2 and 1