Which of the following is a requirement for a trinomial to be factored as a perfect square?

a.

the constant term must be a perfect square.

b.

the constant term must be a perfect cube.

c.

the constant term must be twice the product of the square roots of the other two terms.

d.

the constant term must be half the product of the square roots of the other two terms.

 A.  The constant term must be a perfect square.  

Step-by-step explanation:

A perfect square trinomial is written as , where

first term  = square of first term of binomial

second term=twice the product of both terms of binomial.

and third term 'c'=square of last term of binomial

Thus to create a perfect  square trinomial put 'a' and 'c' a square number

Thus, A is the right answer.

answer: .64

step-by-step explanation

set up the formula for standard deviation for this set of numbers, then simplify