Question

determinati valoarea numarului real m,stiind ca -2 este solutie a ecuatiei: 3x(m-2)-2mx+9=5m+56
va rooooog e urgenttt

Answer 1

$3x(m - 2) - 2mx + 9 = 5m + 56$

$3 \times ( - 2)(m - 2) - 2m \times ( - 2) + 9 = 5m + 56$

$- 6(m - 2) + 4m + 9 = 5m + 56$

$- 6m + 12 + 4m + 9 = 5m + 56$

$- 6m + 4m - 5m = 56 - 12 - 9$

$- 7m = 35 \: | \div ( - 7)$

$m = - 5$