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Answer:
7(2−1)(2+1)
Step by Step Explanation:
1) Find the greatest common factor of the binomial.
28 and 7, the GCF will be 7, and both of them has x, so our GCF of this binomial will be 7x
2) 7x(
-In this you need to divide the 7x to the 28x³-7x, which will be,
7x(4x²-1)
3) But, you could still factorize the 4x²-1, so you will factor it by grouping, to arrive with the simplest factored form of the equation.
7(2−1)(2+1)