Can someone help me with this please

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

For how answer my question this will be the last question can you answer in math subject

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25