tolong bantu jawab ya

[tex](3x+2)(x+a)=3x^2+17x+b\\3x^2+(3a+2)x+2a=3x^2+17x+b\\3a+2=17\rightarrow a=5\\b=2a=10\\a+b=5+10=15[/tex]

[tex](2x+a)(2x+3)=4x^2+20x+b\\4x^2+(2a+6)x+3a=4x^2+20x+b\\2a+6=20\rightarrow a=7\\b=3a=21\\a+b=7+21=28[/tex]