determine the domain, range, and intercepts in these question

j(x) = 4x^2 + 7x
x^2 + 4x - 21

the domain of all polynomials is (-∞,∞)

For j(x), the vertex is at (-7/8, 147/16)
Since the parabola open upward, the range is [147/16,∞)

Now do the other in like wise.