factor expression

Question

28x^2+84x+63

Not sure how to answer this question.
7(2x - 3)(2x - 3)

7(2x + 3)(2x + 3)

(28x + 1)(x + 63)

Prime Polynomia

Answer 1

Hi Shawna,

 

If you are supposed to factor completely then you want to get the expression factored into its lowest level factors

 

In this case

 

7(4x² + 12x + 9)

 

and then

 

7(2x +3)(2x +3)

 

So your second choice in the list above

Answer 2

28x²+84x+63

divide each term by the GCF which is 7

4x²+12x+9

4x²=(2x)², 9=3², and 3*2x=6x, 6x doubled is 12x

this is a square trinomial

7(2x+3)(2x+3)