Solve the equation for r: 3r³ + 12r² = 36r 3r³ + 12r² = 36r 3r³ + 12r²  36r = 0 {subtracted 36r from both sides} 3r(r² + 4r  12) = 0 {factored 3r out} 3r(r + 6)(r  2) = 0 {factored into two binomials} 3r = 0 or r + 6 = 0 or r  2 = 0 {set each factor equal to 0} r = 0 or r =  6 or r = 2 {solved each equation for r} © Algebra House
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