Consider the form . Find a pair of integers whose product is and whose sum is . In this case, whose product is and whose sum is .

Write the factored form using these integers.

Cancel the common factor of .

Factor out of .

Factor out of .

Cancel the common factor.

Rewrite the expression.

Multiply and .

Reorder factors in .

Simplify (c^5y^3)/(c^2+13x+42)*(c^2+4c-21)/(c^9y^2)