The cost, in dollars, of producing x belts is given by upper c (x )equals 751 plus 12 x minus 0.067 x squared. find the rate at which average cost is changing when 256 belts have been produced.

answer:

34

step-by-step explanation:

12cm

the answer is d

the correct answer option is (2x-3)(2x+3).

step-by-step explanation:

we are given the following expression and we are to factorize it:

we are to find such factors that when multiplied they give a result of 36 (9 x 4 = 36) and when added they give a result of 0.

the two such factors of 36 are negative six and postive six.

factorizing the given expression to get:

therefore, the correct factorization of is (2x-3)(2x+3).