PLEASEPLEASE HELP THIS IS OVERDUE

Lassify the function as linear or quadratic and identify the quadratic, linear, and constant terms. f(x) = (3x + 2)(−6x − 3) linear function; linear term: −21x; constant term: −6 linear function; linear term: −18x2; constant term: −6 quadratic function; quadratic term: 6x2; linear term: 24x; constant term: −6 quadratic function; quadratic term: −18x2; linear term: −21x; constant term: −6

Factor completely. 4p^2 + 36p + 81 express the answer in the form (ap + b)^2

What is the solution set of the quadratic inequality x^2-5< or equal to 0