Question

Factor completely: 9x2 + 42x + 49

(3x + 7)(3x − 7)

(9x − 7)(9x − 7)

(3x + 7)(3x + 7)

(9x + 7)(9x + 7)

Answer 1

\[9x^2 + 42x + 49\]

so the first term is: \(9x^2 \)
Then you know:
\(3 \times 3 = 9\)
\[x \times x = x^2 \]
so: \[(3x) \times (3x) = 9x^2 \]

Answer 2

following?

Answer 3

Therefore, choices B and D are right away crossed out as a correct possible answer choice.

Answer 4

notreally

Answer 5

Use FOIL on each one of your answers and see which one works.

Answer 6

yes ^ that also works, it is like working backwards if you do not really understand what i was talking about.