Simple....
you have:
1.)\(-9r^{2} -16\)
2.)\(-45b^{2} -125\)
3.)\(-x^{2}+7x-18\)
Factoring them out completely--->>>
1.)\(-9r^{2}-16\)
Factor out a -1
\(-( 9r^{2} +16)\)
2.)\(-45b^{2} -125\)
Factoring out -5
\(-5( 9b^{2} +25)\)
3.)\(- x^{2} +7x-18\)
Factoring out a -1
\(-( x^{2} -7x+18)\)
Thus, your answer.
