Identify Structure: Identify the structure of the polynomial and look for a common factoring strategy. The polynomial is a quadratic in terms of c2, which suggests trying to factor it as if it were a quadratic equation.
Recognize Form: Recognize that the polynomial is in the form of a quadratic trinomial ax2+bx+c. Here, we can consider c2 as our variable x. So, we have a=16, b=−42b3, and c=−49b6.
Find Multiplying Numbers: Look for two numbers that multiply to ac (16∗−49b6) and add to b (−42b3). The numbers that satisfy this are −28b3 and −14b3 because (−28b3)(−14b3)=392b6 and −28b3−14b3=−42b3.
Rewrite Middle Term: Rewrite the middle term of the polynomial using the two numbers found in the previous step: 16c4−28b3c2−14b3c2−49b6.
Factor by Grouping: Factor by grouping. Group the first two terms and the last two terms: 16c4−28b3c2 - 14b3c2+49b6.
Factor Out Common Factors: Factor out the greatest common factor from each group. From the first group, we can factor out 4c2, and from the second group, we can factor out 7b3: 4c2(4c2−7b3)−7b3(2c2+7b3).
Recognize Common Factor: Notice that there is a common factor of (4c2−7b3) that can be factored out: (4c2−7b3)(4c2−7b3).
Recognize Perfect Square: Recognize that (4c2−7b3)(4c2−7b3) is a perfect square and can be written as (4c2−7b3)2.
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