Упростите выражение :
(3а+5)(3а-6)+30
8х-(3х+1)(5х+1)
(х-3)(х+5)-(х²+х)
(у+2)(у+3)-у(у-1)
(3а+5)(3а-6)+30
8х-(3х+1)(5х+1)
(х-3)(х+5)-(х²+х)
(у+2)(у+3)-у(у-1)
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Ответ:
дакую))))) А то я тупа і нічого не розумію
[tex](3a+5)(3a-6)+30 = 9a^{2} -3a-30+30=9a^{2} -3a[/tex]
[tex]8x-(3x+1)(5x+1)=8x-(15x^{2} +8x+1)=8x-15x^{2} -8x-1=-15x^{2} -1[/tex]
[tex](x-3)(x+5)-(x^{2} +x)=x^{2} +2x-15-x^{2} -x=x-15[/tex]
[tex](y+2)(y+3)-y(y-1)=y^{2} +5y+6-y^{2} +y=6y+6[/tex]