When a problem gives the difference of squares of two related quantities, factor it using a² − b² = (a−b)(a+b). Since the father's age at the son's birth equals the constant age gap (a−b), identify which factor pair of the given number corresponds to a realistic age gap.
Let the son's current age be S and the father's current age be F. The age gap is constant: F − S = k, where...
Full option-by-option analysis available to enrolled students.