Factor.
f(x) = (x + 3)(x − 4)

(−3, 0) and (4, 0)

Use the quadratic formula.

(−1.5, 0) and (3, 0)

See part (b).

See part (b).

It does not intersect the x-axis.

x is a common factor.

After you factor out x, factor or use the quadratic formula to find the roots of the rest.

See part (e).