Question

упростите выр.: а)(5-а)(3а+1)-3а(4-а) б)(2-х)(х+2)+(х+2)^2

Answer 1

а)(5-а)(3а+1)-3а(4-а)=15a+5-3a^2-a-12a+3a^2 = 2a+5

б)(2-х)(х+2)+(х+2)^2=2x+4-x^2-2x+x^2+2x+2x+4=4x+8

Answer 2

б)(2-х)(х+2)+(х+2)^2=2x+4-x^2-2x+x^2+2x+2x+4=4x+8