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# Factor completely 9x2 + 42x + 49. (3x + 7)(3x − 7) (9x − 7)(9x − 7) (3x + 7)(3x + 7) (9x + 7)(9x + 7)

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First step: We have changed x2 for x^2 Second step: 3x^2 x ^2 + 49Third step: now let's factor 9x^2 + 42 + 49We have to list all of the factors, but we'll get to those later Fourth step: you have to rewrite the polynomial by splitting the middle term of use of the 2 factors was found in the factoring. (9x^2 + 21x) + 21x + 41Fifth step: We have to add its first two terms by pulling out the factors that we have been working on. 7(3x+ 7)Sixth Step: to try to sum the 4 terms. Thid id what I mean, ➡ 3x + 7 (3x + 7). Step seven: finally, the result of this equation Answer: (3x +7)^2From the appearance of the same option C. (3x + 7) (3x + 7) would be your answer Good luck