I need help on question 18 help fast

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

Which undefined geometric term is described as a location on a coordinate plane that is designed by an ordered pair (x,y) ?

Simply 8x squared + 5(7x squared- x) - 2x =