Factor by grouping: (1) 4x^2-48x+x-12 (2) 7x^3+49x+4x^2+28 (3) 3x^2+27x+21x+189 11/6/2013 | Math from Long Beach, CA | 2 Answers | 0 Votes Mark favorite Subscribe Comment
(1) First regroup: 4x^2+x-48x-12 Next factor out common terms: x(4x+1)-12(4x+1) Solution: (x-12)(4x+1) Solve 2 and 3 the same way 11/6/2013 | Steve P. Comment
1. 4x^{2 }- 48x + x - 12 = 4x (x-12) + 1 (x-12) = (4x+1)(x-12) 2. 7x(x^{2}+7)+ 4 (x^{2}+7) = (7x+4)(x^{2}+7) 3. 3x(x+9) + 21(x+9) = 3 (x+7)(x+9) 11/6/2013 | Chaitali M. Comment