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HELP ME OUT PLEASE SOLVE IT..............Factor by grouping

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2 Answers

(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
1. 4x2 - 48x + x - 12
 
= 4x (x-12) + 1 (x-12)
 
= (4x+1)(x-12)
 
 
 
2. 7x(x2+7)+ 4 (x2+7)
  = (7x+4)(x2+7)
 
3. 3x(x+9) + 21(x+9)
  
   = 3 (x+7)(x+9)