Question #4b4d9

{(1, 4), (2, 5), (3, 5), (4, 6), (5, 7)}

${(1, 4), (2, 5), (3, 5), (4, 6), (5, 7)}$ a function?

\frac{(3 x - 2) (2 x + 1)}{x^{2}}

$((3x-2)(2x+1))/x^2$ ?

r = cos (θ)

f (z)

f (z) = 2 z^{3} + 3 z^{2} - 14 z - 15

$f(z)=2z^3+3z^2-14z-15$ ?