Identify Structure: Identify the structure of the quadratic expression; it resembles the form (aj)2−2abj+b2, which factors into (aj−b)2.
Find a and b: Find a and b such that (aj)2=25j2 and b2=1. Here, a=5 and b=1 because (5j)2=25j2 and 12=1.
Check Middle Term: Check the middle term −2abj to ensure it matches the original expression. −2×5×1×j=−10j, which is the middle term of the original expression.
Write Factored Form: Write the factored form using the values of a and b: (5j−1)2.
More problems from Factor quadratics: special cases