Question 5)

answer:

the first option, since: x^2 - 9= (x-3)(x+3)

Question 6)

the square of a binomial is a trinomial, namely:

the square of the first term of our binomial, plus the square of the second term of that binomial, plus the doubled product between the two terms of that binomial.

Question 7)

your answer is false, since x^2 + 9 is a sum of two perfect squares

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