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