Question

y^4 from y^n+4+y^n+7
Factor out the designated common factor

Answer 1

is the question

\[y^{n + 4} + y^n + 7\]

Answer 2

remember the index law for multiplying the same base is add the powers..

\[x^a \times x^b = x^{a + b}\]

so it will become

\[y^4(y^n + y^{n - 4} + 7y^{-4})\]

hope this helps