Identify Quadratic Form: Identify the polynomial as a quadratic in form with respect to u2. The polynomial 9u4−22u2w2+13w4 can be treated as a quadratic in u2, where u2 is the variable and 9, −22w2, and 13w4 are the coefficients.
Find Multiplying Numbers: Look for two numbers that multiply to 9×13w4 and add to −22w2. We need to find two numbers that when multiplied give us 9×13w4=117w4 and when added give us −22w2. These numbers are −9w2 and −13w2.
Write Four-Term Expression: Write the polynomial as a four-term expression using the numbers found.We can express the polynomial as 9u4−9u2w2−13u2w2+13w4.
Factor by Grouping: Factor by grouping.We group the terms as 9u4−9u2w2 and −13u2w2+13w4 and factor out the common factors from each group.
Factor Common Factors: Factor out the common factors from each group.From the first group 9u4−9u2w2, we factor out 9u2, and from the second group −13u2w2+13w4, we factor out −13w2.This gives us 9u2(u2−w2)−13w2(u2−w2).
Factor Common Binomial: Factor out the common binomial factor.We notice that u2−w2 is a common factor in both terms, so we factor it out to get u2−w29u2−13w2.
Recognize Difference of Squares: Recognize that u2−w2 is a difference of squares.The expression u2−w2 is a difference of squares and can be factored further into (u+w)(u−w).
Write Final Factorization: Write the final factorization.The complete factorization of the polynomial is (u+w)(u−w)(9u2−13w2).
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