Question

упростите выражение (2b+5)^2-(b-3)(3b+5)

Answer 1

4b²+5²+20b-(3b²+5b-9b-15)=4b²+25+20b-3b²-5b+9b+15=b²+24b+40

Answer 2

(2b+5)²-(b-3)(3b+5)=4b²+20b+25-(3b²-9b+5b-15)=4b²+20b+25-3b²+9b-5b+15=b²+24b+40