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


We have to find 2 numbers so that their product will equal 

-12*3=-36(which is the product of coefficient of r^2 term and the constant term)

and also their sum will equal 5(which is the coefficient of r term).

Factors of -36 are

−36,−18,−12,−9,−6,−4,−3,−2,−1,1,2,3,4,6,9,12,18,36

Selecting the 2 numbers from factors of -36, we get

9 and -4

(because 9*(-4)=-36 and 9+(-4)=5)



May 5th, 2015

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