Question

упростите выражение (3х+1)^2-(3х-2)(2+3х)

Answer 1

(3х+1)²-(3х-2)(2+3х)=9х²+6х+1-9х²+4=6х+5

Answer 2

(3х+1)^2-(3х-2)(2+3х)
9x^2+6x+1-(6x+9^2-4-6x)
9x^2+6x+1-6x-9x^2+4+6x 
6х+5