Question

упростите выражения:-(а-5)^2+(3а-2)(7-а)-18а+6

Answer 1

-a²+10a-25+21a-3a²-14+2a-18a+6= -4a²+15a-33

Answer 2

${a}^{2} - 10 + 25 + 21a - 3 {a}^{2} - 14 + 2a - 18a + 6 = \\ = - 2 {a}^{2} - 5a + 17$