exam Maths Puzzle Numerical Ability

What are the solutions of the following?
(x - 5)(x + 3) = 0

a. 5 and -3
b. 5 and 3
c. -5 and -3
d. -5 and 3

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exam Other Question

a function f is given along with a number c in its domain.
a.) find the difference quotient of f.
b.)Find f(c) by computing the limit of the difference quotient.
f(x)=3 at c=-5
Find all real or imaginary solutions to this equation:

x^-2-9x^-1+18=0

I am no sure really where to start whether I should square the entire problem or what I am stumped. Please help!!