Which method of factoring should I use?

 $64x^2-81$  

• GCF

• Difference of Squares

• Grouping

• Difference of Cubes

 $x^2+11x+24$  

• Difference of Perfect Squares

• Grouping

• Factoring Trinomials

• GCF

 $30x^4-15x^3$  

• Grouping

• GCF

• Difference of Perfect Squares

• Factoring Trinomials

 $x^2-1$  

• Grouping

• Difference of Perfect Squares

• Factoring Trinomials

• GCF

 $2x^2-5x-12$  

• GCF

• Factoring Trinomials

• Quadratic Formula

• Grouping

 $16x^5y^3+12x^2y$  

• Difference of Perfect Cubes

• Grouping

• GCF

• Factoring Trinomials

 $x^2-10x+21$  

• Factoring Trinomials

• GCF

• Grouping

• Difference of Perfect Squares

 $x^2-3x-2x+6$  

• GCF

• Grouping

• Difference of Perfect Squares

• Factoring Trinomials

 $12x^2+17x-5$  

• Grouping

• GCF

• Factoring Trinomials

• Difference of Perfect Squares

 $16x^2-9y^2$  

• Does not factor (prime)

• GCF

• Difference of Perfect Squares

• Grouping