Determine Factoring Possibility: Determine if the quadratic can be factored using the form (an−b)2=a2n2−2abn+b2. We notice that 25n2 is a perfect square, as is 16. The middle term is −40n, which could be the result of 2 times the product of the square roots of 25n2 and 16. Let's check if this is a perfect square trinomial: (5n)2=25n2 (which matches the first term), (4)2=16 (which matches the third term), 2×5n×4=40n (which matches the middle term, but we need to consider the sign). Since the middle term is negative, we are looking for 25n20.
Write as Square of Binomial: Write the quadratic as a square of a binomial.The quadratic 25n2−40n+16 can be written as (5n−4)2 because it matches the form a2n2−2abn+b2 with a=5n and b=4.
Check Factored Form: Check the factored form by expanding (5n−4)2 to ensure it equals the original quadratic.(\(5n - 4)^2 = (5n - 4)(5n - 4) = 25n^2 - 20n - 20n + 16 = 25n^2 - 40n + 16\. This matches the original quadratic, confirming that the factored form is correct.
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