Two numbers that have a sum of zero are?

How do i work this problem out using the equation a=pe^rt

What is the multiple zero and multiplicity of f(x) = (x ? 3)(x ? 3)(x + 5)? multiple zero is 3; multiplicity is 2 multiple zero is 5; multiplicity is 1 multiple zero is ? 5; multiplicity is 1 multiple zero is ? 3; multiplicity is 2

Solve each quadratic equation by factoring and using the zero product property. n^2 - 49 = 0