Example: Multiply and simplify (3x²y)/(2ab) X (14a²b)/(18xy²).

Problem

Multiply the following rational expressions and simplify the result.
start fraction, 4, divided by, k, start superscript, 2, end superscript, plus, 14, k, n, plus, 49, n, start superscript, 2, end superscript, end fraction, dot, start fraction, k, start superscript, 2, end superscript, minus, 49, n, start superscript, 2, end superscript, divided by, 4, k, minus, 28, n, end fraction, equals