I need help with this if anyone can help text the comments

What signals you that factoring by grouping is the best method to use when factoring a problem?

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

Rewrite 9 log, x2 in a form that does not use exponents. 9log, x = log, x