Ответ:
1) ab + 4a - 3b - 12;
2) x² - 4x -21;
3) 10y² - 7y - 6.
Объяснение:
1) [tex](a - 3)(b + 4) = a(b + 4) - 3(b+4) = ab + 4a - 3b - 12[/tex]
2) [tex](x-7)(x+3) = x(x+3)-7(x+3) = x^{2} +3x-7x-21=x^{2} -4x-21[/tex]
3) [tex](2y + 1)(5y-6) = 2y(5y-6)+1(5y-6)=10y^{2} -12y+5y-6=\\ =10y^{2} -7y-6[/tex]
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Answers & Comments
Ответ:
1) ab + 4a - 3b - 12;
2) x² - 4x -21;
3) 10y² - 7y - 6.
Объяснение:
1) [tex](a - 3)(b + 4) = a(b + 4) - 3(b+4) = ab + 4a - 3b - 12[/tex]
2) [tex](x-7)(x+3) = x(x+3)-7(x+3) = x^{2} +3x-7x-21=x^{2} -4x-21[/tex]
3) [tex](2y + 1)(5y-6) = 2y(5y-6)+1(5y-6)=10y^{2} -12y+5y-6=\\ =10y^{2} -7y-6[/tex]