Petra is practicing factoring by grouping. She wants to factor the polynomial 16xy−4x^2+28y−7x. Her work is shown below.

16xy−4x^2+28y−7x
4x(4y−x)+7(4y−x)
(4x+7)(4y−x)

Which statements regarding Petra’s work are true?

There may be more than one correct answer. Select all correct answers.

1. The constant 7 is not the greatest common factor of 28y−7x.

2. Petra is correct.

3. The product of Petra’s factors is not the original polynomial.

4. The monomial 4x is not the greatest common factor of 16xy−4x^2.

5. Petra is incorrect.

6. The product of Petra’s factors is the original polynomial.

could somebody help

2 answers

She is correct!
yes, but you need to choose 2,6 as instructed