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1) (с-2)(с+3)-(с-1)[tex] ^{2} [/tex]
2)3(a+c)[tex] ^{2} [/tex] -6ac
3) 12(2,8х+5,3)
4) -15(9,7y-4,3)
1) (с-2)(с+3)-(с-1)[tex] ^{2} [/tex]
2)3(a+c)[tex] ^{2} [/tex] -6ac
3) 12(2,8х+5,3)
4) -15(9,7y-4,3)
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Verified answer
1)(c-2)(c+3)-(c-1)^2=c^2+3c-2c-6-(c^2-2c+1)=c^2+c-6-c^2+2c-1=3c-7;2)3(a^2+2ac+c^2)-6ac=3a^2+6ac+3c^2-6ac=3a^2+3c^2.
3)12(2,8x+5,3)=33,6x+63,6;
4)-15(9,7y-4,3)=-145,5y+64,5
Verified answer
1) (с-2)(с+3)-(с-1)²=c²+3c-2c-6-c²+2c-1=3c-72)3(a+c)² -6ac=3a²+6ac+3c²-6ac=3a²+3c²
3) 12(2,8х+5,3)=33,6x+63,6
4) -15(9,7y-4,3)=-145,5y+64,5