How can I factor this equation?

Algebra
Tutor: None Selected Time limit: 1 Day

The equation is -12r2 + 5r + 3 

the 2 after the r is raised and so far i have taken out the negative 

-(12r2 + 5r + 3)

May 5th, 2015

-r(12-5) +3...........................................................................................................

May 5th, 2015

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