B1 - Factorizations - Very easy

Examples :   $-4x^2+3x;x\left(x-3\right)+\left(3x-2\right)\left(x-3\right)$

B2 - Factorizations - Easy

Examples :   $x^2-16;9x^2-12x+4$

B3 - Factorizations - Medium

Example :   $\left(5+4x\right)\left(2x-1\right)+{\left(5+4x\right)}^2$

B4 - Factorizations - Common factor - Difficult

Example :   $4x^2-25+\left(4x+3\right)\left(2x+5\right)$

B5 - Factorizations - Discriminant $-$ Easy

Example : $x^2+3x-4$

B6 - Factorizations - Discriminant $-$ Medium

Examples :   $x^2-x-3;-3x^2-3x+4$

B7 - Factorizations - Degree 3 - Without discriminant - Medium

Examples :   $x^3-27;x^3-4x^2+4x$

B8 - Factorizations - Degree 3 and 4 - Difficult

Examples :   $\left(2x-3\right){\left(4x-1\right)}^2-\left(4x+3\right)\left(2x-3\right);x^4-10x^2+9$