Question

Write the trinomial as a square of a binomial or as an expression opposite to a square

of a binomial.
-42a +9a²+49

Answer 1

(3a-7)^2 is the answer

Answer 2

(3a-7)^2

1. 9a^2-21a-21a+49
2. 3a(3a-7)-7(3a-7)
3. (3a-7)(3a-7)
4. Combine like terms