Question

(c-2x)(3c-4x); (a+2b)^2; 5a^2 (2a^2-a+3)

Answer 1

1) 3c^2-4cx-6cx+8x^2=3c^2-10cx+8x^2
2) a^2+4ab+4b^2
3) 10a^4-5a^3+15a^2