Example: Multiply and simplify (a²-4)/(a²-1) X (a+1)/(a+2).

Problem

Multiply the following rational expressions and simplify the result.
start fraction, 6, z, start superscript, 2, end superscript, minus, 48, z, minus, 120, divided by, 3, z, start superscript, 2, end superscript, plus, 6, z, end fraction, dot, start fraction, 14, z, start superscript, 5, end superscript, plus, 140, z, start superscript, 4, end superscript, divided by, 4, z, start superscript, 2, end superscript, minus, 400, end fraction, equals
Which values of z make the resulting expression undefined?
Select all that apply.
    Select all that apply.
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