Use the grouping method to factor this polynomial completely. 2x 3 + 6x 2 + 5x + 15your answer choices area. (2x^2+ 5)(x + 3)b. (2x^2+ 5)(x + 5)c. (2x^2+ 3)(x + 5)d. (2x^2 + 3)(x + 3)

A

Step-by-step explanation:

Group the 4 terms into groups of 2 without changing their order.  That looks like this:

Now within each group pull out what's common:

Now we have (x + 3) common between the 2 terms, so let's pull that out.  With grouping, you know that it "works" if what's in the parenthesis are both exactly the same term.  Ours are both (x + 3).  What's "left over" are the things we originally pulled out, so group those together and you're done!

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